For those who want to consider LIB the last Beatle album can consider this to back their argument. At the time of the AB release (Sept'69) the unreleased "Get Back" tapes that eventually became the LIB album were only about 75% complete. "I Me Mine" was recorded from scratch Jan 3 1970, "Let It Be" the song had numerous overdubs done on Jan 4
(lead gtr.,backup harmonies,brass score,maracas, drum overdubs), "For You Blue" according to some sources state that George's lead vocal was re-done in late Jan, Phil "the murderer?"Spector extended the length of "I Me Mine" about twice, remixed and edited all tracks sometime in March, added orchestral overdubs to "Across The Universe", "The Long And Windy Road" and "I Me Mine" on April 1st with Ringo adding additional drums to TLAWR during that session.
So some might say that considering LIB wasn't quite complete at the time the other supposed last album came out that LIB could be (if one wants to be technical) the last album.