This could be Alvin's last year as a Saint and it would be a massive mistake by Allen

Love AK41... That said... It's obvious he's out the door after this year (if he even plays this year)... He's almost 30 - Which is the start of the RB death spiral with almost no exceptions... and the Saints are not giving him another contract for what "he thinks he's worth"... And it won't be a mistake by Dennis Allen... but I would be willing to place any blame upon him for nearly anything so he can be fired soon... so sure, blame this inevitable situation on Allen.. why not?
There might not be a more conditioned 30 year old athlete in the world than Alvin. Everything you typed is correct. But I won't be surprised if he has a few good years left.