I think as others have said i think the team was probably selected on what happened that week during training.
Once we scored we showed small signs that we were starting to play with a bit of confidence, then Brunt didnt clear it, Livermore got out muscled and Swansea score, its happened loads this season, all the managers and coaches in the world cant allow for individual errors.
Although i wouldnt of made the sub Big Dave did i can see the logic to it, how many times have we thrown away the lead this season, soon as it got to 1-1 our mentality shows that previously we go on to lose, i imagine at that point Big Dave thinks just take the point and end the run of defeats, Greg can help the midfield a bit more and it just tightens it up.
Personally i would of put Burke or Leko on because we were very 'safe' we played sideways and backwards a lot, when your ten points adrift, won three all season, havent won for three months and on your fourth manager of the season confidence is low and nobody wants to be the one to take a risk incase they lose the ball and we concede.
A Burke or Leko would of run at them, lose the ball loads but also gave them something to think about now and again and possibly create something too but i think breaking the run of defeats was the order for saturday and that was done, I imagine once relegation is confirmed then we will see more of the fringe players and youngsters.
Regarding Big Dave, i have no idea if his management / coaching persona is different to the public one but my worry for him as a manager would be he is too nice a bloke! Most (not all) managers have a bit of an edge to them and he just doesnt seem that sort, everyone loves Big Dave, he is just a top bloke but i dont know if that would be the same when your having to drop seasoned pro's, dealing with unhappy non playing members, tell them they are not getting contracts, etc.