I reckon it's because those at boardroom level will be questioning Tim. In the 8/9 games under him, we look really poor and yes the squad is lacking depth, the XI really isn't that bad, there should be enough to get by. There are some decent Championship players in there.
If you take the blind optimism away, we look really bad, defensively we look hopeless and we still struggle to create chances in the final third and the attacking play is quite one-dimensional. A lot of the players we have, simply can't play how he wants to. That was a very poor Plymouth team, we just about scraped a point, we lost to Wednesday's B team and Bristol weren't great either but they should've had a hatful.
I think Travers makes a lot more sense medium/long term (not for £3m though). Stick a ball player next to him and you've got a really good midfield at this level, it would suit Burns.