I agree that Bijan at 12 in all imaginable likelihood is the BPA at 12. That's not really the argument though, imo, enough to make him the pick there.
BPA vs need is the usual argument. And I'd also agree that this team needs as much talent and should be shooting for BPA as often as possible. The problem is that RB is really a whole other animal nowadays. And 100% yes, Robinson can do some more things than than the classic workhorse RB. Receiving out of the backfield, lining up out wide, etc. Nonetheless there's a reason the position has been devalued in recent years. It just takes a toll. BPA vs RB really amounts to BPA vs luxury anymore, and we're at least a year or two away from considering a luxury pick at 12 or better.
I firmly believe Bijan could immediately make the offense better. Unquestionably. The problem rears it's head at the crossroads of where the team as a whole becomes truly contender worthy versus when the decision has to be made on whether to give, and how much the cost, him a second contract. We're talking 4-ish years, at best, before deciding to dump loads of money into a rapidly depreciating asset, which should coincide with just the time the team would hopefully be hitting it's full stride as an AFC standout.
Should they take a QB at 2 like most assume, and should that QB be truly the one, then we're hoping in his year two that we can really push not just the AFC south but the AFC playoffs for everything their worth. That would be fun, of course. Now enter that year 3, and assuming Robinson has been balling out then the contract chatter will already be running high - alongside that of his QB draft classmate. And alongside financially that of whatever 'final' pieces may be in consideration. Given the nature of the position I wonder who the oddman out could be? Dallas had this exact same dilemma. That didn't look fun, and I don't envy having what was a seemingly inevitable outcome.
Bijan is a rare breed for sure. But so seemed Christian McCaffrey. So seemed Saquon Barkley. So seemed Dalvin Cook. These guys do happen. What also happens is Nick Chubb, Miles Sanders, Aaron Jones, Kenneth Walker, Joe Mixon, and Jonathan Taylor. Solid as f*ck dudes you can get later.
And funny enough at the end of the day... not a single one have won a SB.