Weber appears to have passed him on the depth chart. From the games I have seen, Weber plays on the top PP unit, Carle on the second unit. Weber has more points per game, and about twice as many shots per game as Carle. It's a shame, I'm sure Carle would be closer to the NHL if he hadn't been injured so often. Here's hoping he stays healthy and makes up his lost ground.
O'Byrne needs to get some playing time in if he's going to get better. It's a great call to let him play 10-15 games in Hamilton and then see. I don't think they HAVE to recall anybody, but if they do it won't be Weber. Whoever they call will likely sit, so that points to a vet like Henry or Belle.
In Maxwell's case - he's clearly not ready. He's overmatched in every way and you really see the difference between a guy like D'Agostini, who's put in his time, and a rookie pro like Maxwell. If Koivu's not ready I see Chips coming up to replace Maxwell on the 4th line and Pacioretty to replace Tanguay.