It doesn't have to touch a glove to be an E. But it is ultimately up to the official scorer's discretion. I didn't see the play, so I don't know what it looked like. But personally, if there are multiple fielders going after a ball and they all have a chance at it and they all let it drop, I don't assign an E, simply because I don't have one single player to pin it on. They all deserve an E, lol.