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6 for SOD, 8 for TE, the rest are universal. If SOD players are fundamentally unwilling to learn TE, I suggest flipping a coin (heads or tails) when SOD and TE(WT) meet. Many have already realized that Heroes of Might and Magic is much richer than the infamous CM, and many have also become familiar with the WT version and seen the advantages of the new Heroes.
There is no need to divide anyone; what is the point of reverse seeding, like Alex-Stinger in the first round, because they both don't care. 6 out of 23 is clearly a minority in all calculations; it is inhumane to force the rest to play a bare SOD or, even worse, a TE-lite version.
And TE really saves time; it will no longer be possible to set up 3600+400 and drag out the game as in SOD.