His return came on the same day as Ireland's impressive win over Wales but Schmidt resisted the temptation to recall Zebo, who made three appearances for the Lions last summer.
But Zebo believes the reasons behind that can simply be put down to the form of Andrew Trimble and Dave Kearney.
"Talk about try celebrations is nonsense," Zebo told the Irish Independent.
"I don't think there's anything behind that. Joe loves to have fun on the training park and things like that. I don't think I'm the only one to celebrate tries. It's probably people looking for a reason as to why I wasn't picked.
"It's nothing to do with finding reasons. It's simply that Dave Kearney and Andrew Trimble have done such an incredible job to keep the jersey. They've made it tough for me."