@Gryphonknight Yeah, 4x 5* with mixed colour feeding, but with same colour feeding you would be leveling one extra 5*. 
Summary
Total collectible heroes approx 5200.
Assuming uniform distribution among 5 colours, total number of same colour feeders = 1040
Assuming uniform distribution among 1* and 2* feeders, number of each = 520
Total exp for one 5* = 520x180 + 520x468 = 336960
Total exp required to take a 5* hero from 1.1 to 4.80 = 353553
Okay, so almost a full team of rainbow 5*. 