The two times I recall Kupp back on punt return the Rams had already decided that they would not return the punt due to how short the field was. It would not have mattered if Tutu was the second coming of The Flash: the Rams had already decided not to return the punt so Tutu's superior speed was not a factor.
The role of the punt returner on those two kicks was only to decide whether to fair catch or let the ball go into the endzone. It is plainly obvious to me that the Rams want Tutu handing PR duties when an actual punt return is in play, but they rely on Kupp's superior experience when the only job the PR has is to make the decision to fair catch or not.
AlbaNY_Ram
