I thought he did fine. I think he was having trouble steering the conversation then decided to just go with it. I think everyone (Bob, Aly, Simone) was tired so it may have been hard to have a serious conversation. And of course Aly and Simone were very excited.
Towards the beginning he was directing questions but then the wrong person would answer for the other one or just keep bringing up Zac Efron or cupcakes so he just went with it. Btw I think it was fine, and preferable, in my opinion for them to talk about what they wanted to talk about and I think they did. I don't think they really wanted to talk about gymnastics.
I actually thought the first interview after AA was funnier. When they showed Simone's mom and sister hugging and crying, she used the exact tone most people would use for a pet, and said "ohhhh, they're crying! Oh that's so cute! They're nutcases. Sometimes they cry". I just started laughing hysterically. she was obviously exhausted but her tone made it hilarious.