I have to STRONGLY disagree with you here my friend!!!
If Elvis had Parker's dealings investigated, my guess would be that The Colonel
OWED Elvis a substantial amount of money!!! You are precisely right...what deals was The Colonel making without Elvis' knowledge. How about deals like starting Boxcar Records for the HAVING FUN WITH ELVIS ON STAGE album? Although I don't recall the specifics, I do remember reading that by releasing an all-talking album on his own label, The Colonel could by-pass his contract with Elvis, thus being able to profit from the album without sharing the royalties with Elvis. Same thing applied with the budget LP's. By putting a hit like BURNING LOVE on an album with leftover movie songs, the fans would run out and purchase the album (mainly for BURNING LOVE of course) therefore selling an album most filled with songs that The Colonel had half (or more) of the publishing rights to, thus generating more profit for his half of the 50-50 deal.
And speaking of the 50-50 deal,
THAT FACT ALONE should have been enough to warrant an investigation. I'm sorry but NO MANAGER is worth half of everything!!!! So when it all comes down to it, The Colonel was simply able to take advantage of Elvis' trust and his loyalty. Elvis thought that he would have been nothing with The Colonel and was grateful to The Colonel for all he had done for him throughout his career, therefore he felt a sense of loyalty to him. Sadly, it was a VERY misplaced loyalty...one that eventually ruined Elvis' creativity and ultimately his life.
TCB!
Mike