For IL:
2481/1756/2451: 2481 is an incredible landfill bot, 1756 has a very consistent 20pt auto and ramp loads 3 6 stacks (sometimes a 7
) and 2451's energy chain can pullers and ramp-less feeder stacking rounds out the alliance well.
MI, just my speculation:
A 1023/548/503 alliance would have 2 of the fastest can pullers in the world, which helps. 503 handles landfill while 1023 and 548 do their thing. 503 would fight the can wars- the fishing line thing is too useful to let it go to waste (see Archimedes SF2).