I've seen cases where Ephi (or whoever managed the Add-Ons section at the time) would replace a popular, abandoned Add-On with a fixed version before. If anything, someone might just put it in place of the old fillcan to promote the fix. In that case, a further optimized version shouldn't be hard to set out as long as it is understood to be... I don't know, somewhat better?
Point being, that's fine.