So you are forgetting siggurdson is one of our highest earners , captain of the club and one or the senior players of the squad.
Here's a thought. What if ancelotti doesn't want to play Bernard there? What if he rates siggurdson higher than Walcott , thinks iwobi isn't suited to that specific role?
What if he doesn't want to move richarlison from the role he has been playing ? Doesn't want to play a inexperienced kid?
Perhaps , him rating siggurdson higher than other players for a place in the team right now is not a testimony of how good siggurdson is in ancelottis eyes but a statement on how little he rates the alternatives? Why does everything have to be one extreme or the other? Just because he plays someone doesn't mean he plans to build a team around them. Perhaps siggurdson is just the best alternative right now but come August won't even be at the club anymore , along with one or two of the alternatives you mentioned?
As for the captaincy. Come on mate, how many managers walk into a club and actively change the captain in December ? Think about that one, managers don't do that, especially in December. Come August we may have a new captain but siggurdsons ability , quality or lack of commitment isn't a factor to be binned off overnight.
If you want to question my point on siggurdsons commitment , read this thread. I'm not the only one who thinks he has no movement , pace or desire to cover the pitch as he should be doing.
None of this squad is ancelottis , so why take stock in who he picks when he really doesn't have a choice?
When one of the best managers in the game isn't throwing a young lad with next to no experience into the side whilst we have something to play for, I'll back that decision.