I still prefer Dedede - chasing potential killers is better surely? If he flips scum that's going to clear me, if he doesn't, it's between me and someone jailkept or someone protecting the right person. Either way it narrows things down quite considerably, and as I said before, we can force Magnus into a hard lie if we trade his life for a track.
For example, kill Dedede today, and tonight force magnus to track me, and request the mirror tracker to track me too. If he does it and I don't die, we see who he says I targeted. If it checks out, we don't need to lynch him. If anything goes wrong, we can hammer away. Might be more revealing plan?