OPT, Oregon Purple Thai. Used in the creation of the blueberry. Among other lines. Well over 90% of tris/quads can be traced back to it. If it was environmental, they'd both be doing it.
Pet theory time, the multi site branches probably have more copies of the gene lea13 which generates new lateral growth and pops a leaf at the site.
It gets tiresome when they faciate, which is undesirable.
Otherwise they just tend to need more food, and will revert to normal if rootbound, but the multi site plants are not undesirable.
A very interesting thing to do would be to clone one of those branches, and see if it also puts out Tri quad branches. If it did, that would be a fascinating plant.
Fwiw.. the 2 quad branches happened on the second pair of nodes. (first ones threw normal branches) above that the plant was topped and threw some tri nodes as it went into flower. The quad sidebranch stems were also hollow. Clone survived my 2 day absence and is still in play.. need to go spray it actually. Root growth/mass on both males was very similar but if anything the tri.quad male had slightly more.Merry Christmas mate.
Gonna watch that cut harder than any other on the site.