Enough people still in this agreed this is a decent method, otherwise this could well end up going into next season.
Would be way better to just let this go all the way to the finals and let the decider be who can most accurately predict the final score. First in first served is pretty unfair.
I'd just do it so that you can't choose the same team to win or lease in a 3 week cycle. Or you can't tip the same team to win twice in a run at all until you've tipped them all to win oncw