Everything after the 1st bid choice is as worthless as underboob on a boar hog. Without knowing what the preceding bid choices were, there is no way to determine the possibilities. Assume a pilot of seniority #5000 has NYC M88 A as his second bid. If that pilot's first bid is DTW 744 A, then this pilot's first realistic bid is the NYC M88 A and he would be a player for you to consider. If that same pilot's first bid were ATL 717 B, then the second bid of NYC M88 A is irrelevant because this pilot would most definitely get ATL 717 B and thus he would not be a player for you to consider.

Additionally, any pilot can change what they have in the system right up until the bid closes rendering any time and effort you have put towards trying to figure things out completely useless. It's just my opinion, but don't waste a second of your life worrying about what other people might be bidding. It's pointless. Focus instead on what you really want. If you want something, bid it. If you don't want something, don't bid it.