The way I see it, Alex's lack of understanding of what makes a complete team is precisely the reason why he's not fit for the job. There's no doubt that he's done some positive things earlier on during his tenure when the pressure of winning wasn't strong... but when it comes to putting it all together, he has failed miserably. IMO there's simply no excuse for a team who's expanding its budget by $40+ million and pushing all their chips in to have such glaring issues with depth. Giving 51 starts to guys who were not even on the team's radar at the beginning of the season is not just a result of bad luck, it's a result of poor planing. Trading away the two SS in the system to bring in Reyes to play on the turf and relying on scrap pieces to fill the void when he's injured is also a symptom of the same problem.
The more disappointing part for me is that he doesn't even seem to have learned a lesson for those mistakes, and although with Hutch and Stroman the team is in a better position as far as SP is concerned, there are still huge issues with the team's lack of positional depth, particularly in the middle IF.
Overall, I'm sure there are plenty of GM's who are in fact worse than AA but that doesn't concern me much. What I care about is if he is capable of turning this group into a legitimate championship caliber team and I think the answer to that is a resounding NO at this point.