Well, it's a tough call.
I agree assists are more important than most give cred for. And for some damned reason, Motion leads to fewer assists than some of the other offensive options. I suppose the question is efficiency.
In a 'outside' type of offense, such as I play.. the guards are going to shoot more than pass of course. On the 'inside' based offenses.. guess what, the guards will probably (and at times not which is strange) shoot less and pass more, leading to more assists and less points. So comes into play.. voila, efficiency. If Prado del Rey shot a better percentage, I'd be more likely to agree that he's worthy of being a top 3 PG. I am not sure he is, but then again, we all know I could care less about studying other teams.. at this time anyways.
As for which teams they come from, it's the typical argument you hear in professional basketball. Do players who put up nice numbers for a crappy team deserve the credit, as in All Star status or MVP. Could they do it on a winning team. Answer is, probably not since the better teams tend to have more than 1 or 2 options.. are more well rounded and spread the wealth (cue sports cliche bs). So as a team, with more options, the numbers are spread and look less impressive, yet if I had one of those inside guys from TF, he'd probably average a ton more than he does for TF.
Sorry for wall of text, glad you woke up.