Chance are its a bad fit. Murray may still not be able to shoot despite his reported progress, White is a low volume 3pt shooter and DeRozan is useless without the ball. DeRozan and Murray are both going to need the ball meaning White would probably play mostly off the ball even though he is probably the best passer of the three.
Murray, Forbes, DeRozan, Gay, Aldridge
Mills, White, Belinelli, Bertans, Poeltl
makes a lot more sense; White can have long stretches where he can be the primary ball handler off the bench and still end up playing like 28 mpg. DeRozan would be the primary ball handler and Murray, the secondary, in the starting lineup and Forbes would be in there to space the floor.
The closing lineups would still likely be Murray, White, DeRozan, Gay/Bertans and LMA though.