I'm not sure anymore whether I expressed myself clearly:
I don't have anything against a multiplayer tournament; it's just that I'd prefer consistency (since the best '4 player style' players might not make it to the final table if it's only 2 player matches to qualify for that) in terms of either
a) have 2 player matches all tournament long or
b) have multiplayer matches all tournament long or
c) have both mixed but from the beginning (and involving same pairings of players in both 'styles', too).
A suggestion for case c) would be to start with 8, 16(?) groups of 4 players. They have 2 player matches against each other (6 matches in total; boX (X=5, 7?)) and a series of 4 player matches (4, to insure everybody started in every position once). Add some points to be given for 1., 2., 3., 4. place so that 2 player and 4 player matches are equally important and you'll have a table for each of the 8 groups. The top 1 or 2 players of each group move on to the next round etc.
It could result in a rather long tournament, I guess, and it's not necessarily a suggestion for the coming IsoDom Challenge, but I think it's pretty interesting and something one might like to keep in mind.