I am of the same thought. Ethan is still taking 4 bottles, each are 7 oz. He doesn't always take it all, but the routine works for him. If he starts to sleep later in the afternoon, during his usual bottle, then I *might* consider dropping it, and giving a small snack when he wakes up instead. But that's a what if.
I think if Emily is happy with her current bottles, leave it as is. My ped recommended that I just let Ethan take the lead on the bottles right now.