I'll give you a real answer.
It's not if you know the position, who's defending who & which positions effect each other.
1)If anything RB/TE might help each other out. They run very similar routes for the most part, attack the same area of the field for the most part and are defended by the same group's for the most part. If you look at any heat maps of route running you'll see this hold up.
2)We've seen Thomas without Kamara and he's still a 100/1400 player in that offense. We actually saw him put up #'s without Brees if I'm not mistaken.
3)Saints aren't worried about losing AK. They'll roll with Murray, Hill and figure it out and Thomas will still put up big #'s. If they're not worried I'm not.
Does it help having great players at multiple spots, sure. But Bell isn't opening up things for Brown. Zeke isn't opening up thing for Cooper and same with AK & MT. If anything having a great WR helps them a lot more.