I think perhaps it actually helps matters that they chop and change a bit. When a player comes in he's used to playing with the others and knows he's not just there as a stop gap but as a trusted member of the unit.
Take your point about playing people out of position, there's been too much of that in recent years. Always thought LJ gave his all, but he wasn't up to it.
For next season I'd like to see us bring in a new centre back as but can't see us needing any other defensive reinforcements.