If your plant doesn't look like an indica or a sativa, I'm sure that it's something inbetween. MK-Ultra is OG Kush x G13 and people say that it's mostly indica in expression but I'm sure that there are some sativa phenos of it as well. I think that they used the Mr. Nice G13Skunk for that cross (G13 is a clone only plant so there are no true G13 males, only G13Skunk, G13Haze and G13Hashplant etc).
I'm not sure what you friend meant by what he said, perhaps what he was trying to tell you is that the plants will respond poorly to topping and training.
You can still try topping the plant. Perhaps you will have better luck. Some say that it works well for this strain. It all depends on what sort of plant you've got.
Some plants don't like to be topped but most plants will respond positively to LST'ing. It will work well on plants that tend to stretch a lot. Tall and lanky plants can be made quite compact with this technique.
You can also try super cropping because the plant might like it better if it responds poorly to topping. Super cropping produces the same result as topping and LST'ing combined.
Both metods will give you an even canopy and bushy plants as long as you give them enough time in veg.
Some people reported that this plant is perfect for SOG. Again, it mainly depends on the phenotype. Compact indicas with tight bud structure are well suited for SOG grows, stretchy "foxtailing" sativas not as much. Your plant might fall somewhere inbetween.
You can also go with monster cropping if you have enough plants. You don't have to top those plants because they will probably branch out on their own but they might need some training and scrogging for good results.
If you find it difficult to make up your mind, try several different techniques on different clones. You can also try combinations. That way you will know by the end of your next grow what really works and you will also have learned a ton of stuff about training plants.
It's all about unlocking the full potential of the plant. Some things work better than others. It's a game of trial and error.
You should perhaps ask your friend to give you more information about the plant before you make a decision.
Regarding the flowering clones, the hard part is getting them to root. If they remain healthy, they will probably revert back into veg sooner or later. When they have rooted properly, start feeding them vegging nutes. It might help. I cannot tell you which plant will be a good candidate for monster cropping because they are all different. The only way to know for sure is to try it out.
I'm not sure what you friend meant by what he said, perhaps what he was trying to tell you is that the plants will respond poorly to topping and training.
You can still try topping the plant. Perhaps you will have better luck. Some say that it works well for this strain. It all depends on what sort of plant you've got.
Some plants don't like to be topped but most plants will respond positively to LST'ing. It will work well on plants that tend to stretch a lot. Tall and lanky plants can be made quite compact with this technique.
You can also try super cropping because the plant might like it better if it responds poorly to topping. Super cropping produces the same result as topping and LST'ing combined.
Both metods will give you an even canopy and bushy plants as long as you give them enough time in veg.
Some people reported that this plant is perfect for SOG. Again, it mainly depends on the phenotype. Compact indicas with tight bud structure are well suited for SOG grows, stretchy "foxtailing" sativas not as much. Your plant might fall somewhere inbetween.
You can also go with monster cropping if you have enough plants. You don't have to top those plants because they will probably branch out on their own but they might need some training and scrogging for good results.
If you find it difficult to make up your mind, try several different techniques on different clones. You can also try combinations. That way you will know by the end of your next grow what really works and you will also have learned a ton of stuff about training plants.
It's all about unlocking the full potential of the plant. Some things work better than others. It's a game of trial and error.
You should perhaps ask your friend to give you more information about the plant before you make a decision.
Regarding the flowering clones, the hard part is getting them to root. If they remain healthy, they will probably revert back into veg sooner or later. When they have rooted properly, start feeding them vegging nutes. It might help. I cannot tell you which plant will be a good candidate for monster cropping because they are all different. The only way to know for sure is to try it out.
Kodiak! 
