Also, being Andorian makes him the first non-heterosexual captain.
If you mean captain of a ship named Enterprise
, then you're probably right, but beyond that, there has been at least one lesbian captain in the literature already, Captain Margaret Sinclair-Alexander from Crucible
. And T'Prynn was a captain in the alternate timeline of A Less Perfect Union
. We've certainly seen Andorian ship commanders before as well, notably Shran.