Eh, if they actually nail the head coaching hire, I don't really think it's a terrible thing if you have to backfill GM with a glorified player of pro personnel type to run the front office (if Poles experiment flames out). Like many NFL structures you'll just have a structure where the HC is equal or above the GM. Plenty of teams do this.
At this point, Poles biggest accomplishments are having enough guts to lead a tank job and then taking advantage of David Tepper. Everything else is probably replacement level GMing on the whole.