What you say is true, Lennon wrote better lyrics and McCartney was the better arranger. Even so, Lennon wrote Imagine solo and Mc wrote Maybe I'm Amazed solo. Each of them as solo artists had prolific and very successful careers. To return to the original thread, only Clapton has been successful post cream, though I love "/Songs for a Tailor"--Bruce's critically acclaimed but commercially unsuccessful album.
Also, however, Cream benefited greatly from an incredible arranger (and average bassist/singer) named Felix Pappalardi, who produced and arranged "Wheels of Fire" and "Disraeli Gears," then later was killed by his own wife. He was the George Martin of the group.