Is there any way to remove gold L-2 on Edo Hashirama? I am trying to get all his gold skills except for his standard attack, but I got the gold L-2 but I don't want it - I keep testing to try to remove it and it won't go away whatsoever, and trying to select just the regular standard attack tells me "L- skill can only be changed with L+ skills", but his standard doesn't have any L+ skills. Is it really stuck like this forever now?

Edit: I unlocked Hashirama's gold L+2 healing and it let reset me the gold L-2 standard. Now I have to get the gold L+2 healing back :(