I wouldn't say it's strange when it's apparent Lucci's vastly improved if he's now worthy of being in CP0, especially if taking into account his non-canon feats until they're contradicted. I highly doubt a Lucci that entered the New World and was under a Yonko's command for a significant amount of time would be trash with how much some characters suggested to be nowhere near as talented have improved after the timeskip.
The main problem I have with Who's Who is how forced his character is. Despite the ties to the World Government in his background, it doesn't seem like it'll play a pivotal role in the plot and the acquisition of the Gomu Gomu no Mi having been a Cypher-Pol mission makes Luffy's status as a special individual even more unnecessarily forced than it was already.