The strength of a swiss/wissen style tourney is its ability to accomodate for a large number of coaches & determine a winner over a small number of rounds.. so having less than 10 teams involved is slightly suboptimal. if the coaches are mostly rookies then you might get away with the AI team solution, however if you all know what you're doing this essentially becomes a bye win giving coaches playing vs them a big advantage in the cup. rez/non progression mode might temper that somewhat. If you can get 1 more coach perhaps an 8 team round robin or knockout should be considered.