I have maxed out Wu Kong twice. One has emblems, one doesn’t. I only use the second Wu in wars, and I now have enough 4* & higher heroes that the second doesn’t always get used. I sometimes regret leveling a second, as I now have pulled Justice, Leonidas, and Li Xiu from my TC 20, plus Guardian Jackal, and am slightly short on materials to get both 5* to 3rd chevron, and Li Xiu maxed. This all came after I got a second Wu.
I would NOT level more than 2. Maxing 4 will take ascension materials away form other heroes that do different things you will want to level. I used a third Wu Kong as food.
Sorry, it’s understandable, people post a bunch of things here every day, I don’t expect everyone to read all of it (I only pretend to read most of it myself).
It was just kind of funny because someone else posted almost the exact same question a day or two (okay maybe it was actually more like 3 days) ago. I voted in favor of multiple Wus because I like Wu, but I think most of the other responders voted to feed extra Wus straight through the meat grinder. I believe the majority of forum regulars would tell you there is no use in keeping multiple Wus. I chose a different path. I don’t believe there is any such thing as too many Wus.
But also the majority of forum regulars would most likely tell you never to listen to anything I say, and they’re probably right because I’m oftentimes wrong, so you should probably listen to them.