I hadda go back for a refresh & look at Doc's original post...
I see Graham is there because he "invented slap".
I recall a Chuck Rainey interview in a '70s
Guitar Player mag (Merle Travis is on the cover...pick it up on EBay)-
http://www.ebay.com/sch/i.html?_kw=Guitar+Player+Magazine+Merle+Travis
Rainey mentions Monk Montgomery as the 1st EB slapper; Monk was also an URBassist & no doubt was familiar with Slam Stewart, Milt Hinton, et al & incorporated slap into his EB playing. IIRC, Rainey does go on to say Graham & Louis Johnson, working independently of one another, developed slap for modern electric bass (Anthony Jackson may have said someything similar in an '80s issue of
Guitar Player/Robert Fripp is on the cover; The AJ article/interview is excellent & should be the standard for
Bass Player magazine's articles.). Pick this one up, too.
http://www.ebay.com/itm/GUITAR-PLAY...-RONNIE-EARL-RARE-/280695813679#ht_2498wt_684
Anyway, I'm rambling...so Entwistle for Rock? I don't disagree, although-
I'm a product of that time & I would say Jack Bruce was always mentioned...John Paul Jones, too...McCartney, yes (if you knew he was The Beatles' bassist).
In the aforemnetioned Anthony Jackson interview, AJ sez Jack Bruce was not an influence...but Jack Cassidy (Jeffereson Airplabne) was.