Buchanan has played RB for us on at least two occasions- both last season, when we had injuries to both Moloney and Phillips. Paul Anderson played LB and Buchanan went to RB.
I think you are thinking of the Rovers away game last year. Anderson started Right back but went off injured and I think Buchs then moved across with Taylor going left back but I could be losing it. The other time injury left us without a Right Back I'm sure Page stuck Diamond out there for half hour or so.
I think it is pretty inevitable that Poole will play Right Back Saturday, I think he can do a decent enough job there as a stop gap, S McWilliams is hopefully fit enough to play in midfield anyway so Poole probably wouldn't start there.
With what is in the squad I'd have Long as my lone striker in the 4-2-3-1 all day but he's still unavailable I'm guessing. In which case Rico will start so we need to make sure we get as much energy and legs around him as possible. Hanley Left, Hoskins right with Waters in behind anyone?
As for everyone wanting young players to start, I agree we need to blood them and give them a chance but there is a balancing act to find, you can ruin a youngster as well. In my mind there is no excuse for Iaciofano to have not been on the bench several times so far this season, having made 5 or 6 sub appearances. We'd know a bit more if he is ready for the team or not now when the injuries and suspensions are biting. The younger McWilliams is possibly too young but maybe if they'd given him 20 minutes / half hour in the tin pot cup we'd know. It looks an especially poor decision to play Maloney for the whole of that game now.