I'm mostly pointing out that the bassist played more lead than the usual rhythm guitarist - of course George did the majority of the leads, especially in the early years. Paul never played lead guitar live with The Beatles, but he does switch to guitar in his solo concerts.

And he did lead in the studio after recording his bass part with the band, or in the later years, John or George sometimes played bass. That's Paul doing lead on Ticket To Ride, Taxman, Back In The USSR and others.