Juan benefited from playing next to a guy that could create and leave him open. He is a pretty efficient scorer when this happens - and that's why he got play time next to Roy. He played next to Bosh in Toronto, next to Arenas in Washington and next to Billups in Detroit. Blake played next to AI and 'Melo in Denver and next to Arenas and Huges (when he was still good) in Washington James Jones played in Phoenix next to Nash and Amare and was nowhere near as good as he was for Portland last year. He owes Roy the big salary he got from Miami. Randolph's year pre-MF was notwhere near as good as his last year as a Portland player next to Roy - his best year prior to Roy was actually his 2nd year in the league - not that one you refer to (nearly 20 PER in his 2nd year, 18.6 the year he got wounded, 23 PER next to Roy). Way to twist the facts and choose to ignore them when they do not fit your wrong theory...
