For me McNamara is the obvious choice

it needs a top class coach and a shake up of the squad. anyone who has watched them week in week out will tell you that

That's the coaches job. If he doesn't shake things up, he'll need showing the exit.

Obvious to everyone except the G-man

That's is OK provided the bosses are prepared to back the coach - Hetherington has let the players dispose of Powell, Smith and McClennan - McDermott will be next

Didn't smith leave as he wanted to take the role of coaching the national side? And mclennan left a year early of his own choice.

The pickle Leeds are in reminds me a little of the situation Chelsea were in in the last wendyball season. Too many ego's in the dressing room that think they know better than the coach and will point at their winners medal collection when the coach tries to take them to task. The term "nest of vipers" sums it up I think. It tends to happens whenever the same group of players remain successful through several coaches. The sooner McDermott goes the sooner things will turn around there I'll bet, although whether the senior players at Leeds are still capable of producing at the required level remains to be seen

Is there any evidence that this is actually the situation?

It doesn't take the backing of the bosses to drop under performing players.

Powell was made Director of Rugby, not disposed by the club. Was it true he didn't even have any coaching badges?
Smith left for the national job, not because the players didn't want him. He won the SL with them in his last year.
McClennan left a year early from his contract of his own accord.

Basically, you've just made all that up!

No he hasn't. Powell was shuffled sideways/backwards but the other two were basically, without being sacked, forced out of the club.

To correct you.

Powell had all his coaching badges before he ever became Leeds coach, he was given a non-job to placate him as he had been with Hetherington since to inception of Sheffield. That job lasted 6 months and he was shipped off to RU. He was supposedly going to take over after Smith but that never came to pass either. No young coach wants a DOR job over that of first team coach. Smith had already announced he was leaving Leeds before the England job came up - the terrible 2006 season did for him. Hetherington just used his control at the RFL to get Smith the job. McClennan would have gone at the end of 2009 but for a contract foul up by the end of 2010 he was not wanted by the players - google Sinfield's comments about the players view on the end of McClennan. Rumour is now that the senior players can no longer work with McDermott so I doubt he will be in charge next season. So not made up - I don't profess to know anything about Hull and you quite clearly know little about Leeds.