The main question here seems to be, what decides which clan gets the spot in group A? (1) The clan containing the most players that participated for 101st in season 4, or (2) the clan containing the most players from 101st after the 101st/Lynx split? If we go according to (1) then Lynx gets the group A spot. If we go according to (2) then 101st gets the group A spot.
Going back to what JSA decided between seasons 3 and 4:
XCD is not CPU at all. I believe 3 players from CPU are in XCD. Same as WG.
BIA will represent CPU. I believe it is split up about half and half but BIA has all of the better players previously in CPU. If we go into technical rules, we could possibly let CPU compete in A League since the CPU name was used. However, I consider BIA equaling CPU since all of BIA's members are of CPU and they are equal to the rest of the CPU clan. The current CPU clan did no work to stay in Group A, that fell mostly onto BIA's shoulders. Plus more competition in A League is better than less competition. So my verdict is obvious, BIA will be in Group A in place of CPU.
http://warlight.net/Forum/Thread?ThreadID=6309&Offset=180JSA is a bit ambiguous here unfortunately. On the one hand he cites the fact that most old CPU members became BIA. Which would support (1) above. But then he says "The current CPU clan did no work to stay in Group A, that fell mostly onto BIA's shoulders," which supports (2). Also supporting (2), "Plus more competition in A League is better than less competition." So if the decision is made based on JSA's rationale at the time BIA took the CPU spot, then Lynx should take the 101st spot.