I was at the final Pittsburgh performance, so saw Ciara. She was incredible and, though nothing was ever said, of course, my mind filled in the adoption idea (too many episodes watched of "This Is Us"? LOL!) which led to two very interesting subtext moments - 1) When Evan was describing the things he loved about Zoe, but making them into Connor's thoughts, there was a bit of a "was my adopted brother in love with me" vibe and 2) When Zoe has her meltdown about "Always about Connor" there was another layer of slight, possible adopted child envy of natural child. Didn't detract in any way and, as stated somewhere above, I thought it brought some new subtextual layers to the proceedings. Just my 2 cents.
<-- Tevye, FIDDLER ON THE ROOF, March 2018