[quote=@banjoanjo]I can't say that I can see what difficulties would arise with a player using first person.[/quote]

First thing: it reads badly to have a single first person amongst a mess of third person. Secondly, it [i]does[/i] make it more complicated.

So far, it's pretty nice and simple, because you have two other characters that look nothing alike. But that's going to get a lot more obfuscated when scenes get more crowded and they look more similar. First person is also a great way to make action far harder to follow. 

The only time I've seen first and third person mixed well was when it only changed on a chapter-by-chapter basis. <_<