The ole 'not a scientist' caveat, but:
Two things jump out at me:
1) As much as I am typically a data-driven, 'citation needed' kinda guy, I know what rolling has directly done for me in the past. I know the tangible differences I can feel with tight quads before and released after rolling. Studies can say what they will, but I'm sticking to foam rolling. Which leads to...
2) It seems like, from a quick read, that the studies measured the difference in sprint, jump, "strength performance" and flexibility. I don't recall ever hearing people talking about a roller in those terms. Understand that science needs quantifiable measurements, but I wonder if this is a case of the tangible benefit (ie, my muscles not being one giant knot) being hard to properly quantify. I suppose you might consider it flexibility, but in that case, there was a positive result, as well as with pain perception.
Ultimately hey, I don't know what I'm talking about really, but I know what foam rolling has done for my legs, so I'll carry on, personally.
JustinDoesTriathlon Owner, FuelRodz Endurance.