Just read an article where Bruce says we are hampered in the loan market from getting lads from Manchester, Arsenal or Chelsea as they want players playing in the prem league.
Then he goes on to say how he had success in getting Hull and the Bloose promoted using the loan system and how well it worked for Huddersfield last year.
First of all those three teams you mentioned weren't in the prem as they were all promoted so there goes your logic.
Second. There are other teams than those 4 you mentioned including some great ones overseas.
Third. Villa's youth side have some good available players you could loan in. Oh wait, you don't have to loan them. We own them!