the green arrow/red arrow alone is an effective way to indicate the player's improvement, but i don't know whether it has been announced or not.
yeah, the only problem that i have is that... the green arrow doesn't stay for that long in the roster page
so IMO i think my suggestion can be effective for other players who don't regularly play BB.
It may eventually come to pass, but if I had to guess, it's probably not on the front burner.
but 1 month later I tend to forget what i have trained the previous month and which players got which pops
but 1 month later I tend to forget what i have trained the previous month and which players got which popsI make notes of what I trained each week and who popped. I use Excel. There are free spreadsheets like OpenOffice which will do the job, too.