Hindsight is great, isn't it?
So, down to 10 men, getting a bit of a bombardment, you're going to bring a small RWB on in midfield? Berge is poor in the air, but not as poor as Bogle. I'm pretty sure had this happened and Bogle hadn't tracked a runner (he'd never been trained to do) and they got back in it then the manager would have been at fault.
Sometimes you need to take one to see out a game. I'm pretty sure if Hecky 'protected the players' and the subs made mistakes and Coventry got a draw then the manager would be clueless.