It's partly the speed, I'm sure, but Ron also loves to do these kind of scenes or stories where unlikely or oppositional pairings come together in a time of crisis and outright embrace and sometimes become BFFs. He did it with Téa and Blair on OLTL during the former's fake cancer storyline, and given their history it only really worked there and on the online show because the actresses are close IRL and had such great chemistry playing off each other. But when on GH, he had Robin Mattson's psychotic Heather Webber being played for pathos by confiding in and hugging little Rafe Kovich Jr. who she barely knew? Or various incidents with Franco or Obrecht or whoever else? Come on. And it's always to service one specific character he loves and not the other.
I think Haiduk is a brilliant actress - I'll never forget her cameo in HBO's Sharp Objects with Amy Adams, where she was unrecognizable and spellbinding in a very brief scene. If anyone could pick up from Eileen it's her. But reforming Kristen to this point, which it seems is what Ron wants to do, puts any recast at a severe disadvantage because it's making Kristen unrecognizable.