Just pick your favourite name from each list. It doesn't have to be the 'longest serving' or the 'most worthy', just your favourite. You can add an explanation if you so wish. [note: I have only included the key players - it's not an exhaustive survey]
Singer: Anderson, Horn, Rabin
Guitar: Banks, Howe, Rabin
Keyboard: Kaye, Wakeman, Moraz, Downes
Drums: Bruford, White
Let's take Squire as a given, eh? --- although if anyone has any other suggestions!