JBroadway said: "I agree with Kad! This strikes me as a very lateral casting change. Martin, White, and Nielson are all equally wonderful in my eyes. Of course I’m sad to hear that Martin is injured, but from an audience standpoint I don’t think we’re getting shortchanged!"
That, and Lane's selling 95% of the tickets. Andrea Martin is slightly better-known Kristine Nielsen and Julie White, but no show is selling out on Andrea alone. (Not a knock on her talents in any way, just the reality.)
If Lane had been injured, they probably would have just cancelled/postponed the production altogether, rather than replace him with a lesser talent (aka anyone) and have a refund nightmare.