Elvis was 30 when they met. The Beatles were expecting too much. Lennon at 30 was not the same as Lennon in 1965.
The Beatles wanted Elvis to Get Back to Rock 'n Roll. After they left Elvis recorded his gospel album.
With that, Elvis was actually staying true to who he was. His first love was gospel music.
When people compare Elvis to The Beatles you are talking about two completely different entities. Elvis was very American.
Elvis lit the match. No sense in not giving him his due.