The evidence posted here is on pretty weak footing 'Pus.
Study 1 compared 75g protein and 15g Leucine to 23g protein and 5g leucine and no protein/no leucine. It's to be expected that MPS will be higher when you basically triple one's protein intake.
Study 2 was done on very elderly patients who's needs differ from ours and again, compared leucine and protein to just leucine with no protein. Of course an extra 20g of protein is going to make a difference
Study 3 did protein infusion which significantly alters things when compared to getting protein in the diet.
I know myself as well as many others like Zilla, Rockwell, Dr. Scally and Jim, CBS, etc also have mentioned that taking results from studies in an acute setting and applying them to chronic,long term results can be tricky. The body has a way of compensating for these small differences in the big picture so while these studies are interesting of course, there's still a lot left to be desired.