Using a pass early can be good or bad. Part of the issue right now is that we still don't know which bulls are going to be dealt out next and that can have a huge impact on what you get to keep or have to throw away before the scoring.
Regardless, My best bet is the Red 7, since either an "All even" or "All Green" will decimate my hand anyway. I think at this point, train has been gone long enough that I'll just take over. If he comes back, we can switch back.
I'm not dealing out cards until they are needed, so I won't have any advantage over anyone else.
EricBess: Green 4; Green 6; Red 7; Pass
Spiderman: Money; Pass
Mooseman: Green 3; Money ; Pass
Melkor:Green 3; Red 7; Money; Pass
Ransac: Green 7;
China: Red 5, Red 5, Blue 5, Green 5
Bulls: 2 any
Spidey - One thing to keep in mind is that the bulls won't shuffle back in until they have all been used. There are a total of 30 bull cards and 10 of those are "all", with 2 of each (all red, blue, green, odd, even), so if one has already been played, it is less likely to come up again.
One other thing I've noticed that might help...It's helpful to look at not only what position you are in, but where everyone else is also and what china/bull they are likely to take.