No, I was not suggesting that Matthew 28 and Mark 17 mean ordination and the missionary commission are identical.  But Matthew and Mark both report that only "the Twelve" (all men) were present at the Last Supper, where Christ said "do this is memory of me."  Likewise, both report only "the Eleven" (again, all men) were present when the commission to preach, teach, and baptize was given.  So they have something in common, the fact that Matthew and Mark do not report women being present at either of these events.

Here's what my logic tells me.  If "the inclusion of ONLY the Twelve at the Last Supper" means women must be excluded from ordination, then the inclusion of only the Eleven when the commission was given means women also must be excluded from teaching, preaching and baptizing.

If the absence of women requires their exclusion, it requires it whenever they are absent ... not just when it delivers the desired conclusion.