Let's see. The question is how has to speak first.
1) Morgrim speaks first :
1a) Morgrim is scum and 2.7 is town : Morgrim guesses a target, 2.7 outs him if he's wrong. Note that Morgrim could be lucky. The question is what is the obvious target for 2.7 ? I don't want to discuss that too much, but I do believe this plan somewhat reduces the Bodyguard's potency in night 1.
1b) Morgrim is town and 2.7 is scum : This is the ideal situation I think. Morgrim can out 2.7 if he targeted no one, or if he targeted the night kill. Well, not really out because strrongman kill can exist. 2.7 could also be a Rolecop. If that's the case, he can also frame Morgrim by saying the result is false.
1c) Morgrim is town and 2.7 is town : That's pretty easy, but I don't think we can actually clear them because of the way the other scenarios play out.
1d) Morgrim is scum and 2.7 is scum : They can do pretty much whatever they want.
2) 2.7 speaks first :
2a) 2.7 is scum and Morgrim is town. If he's Rolecop he's fine. Even if he's not he might be JOAT and perform a strongman kill. That requires a lot of things though, so I guess that situation is pretty good because we can clear/out 2.7 probably.
2b) 2.7 is town and Morgrim is scum. Then we learn nothing, since 2.7 speaks first and Morgrim confirms.
2c) 2.7 is town and Morgrim is town. Again, the other scenarios make it pretty hard to clear them. Like, let's say 2.7 targeted me and I didn't die, then Morgrim confirms this. We could still be in 2a, 2b or 2d.
2d) 2.7 is scum and Morgrim is scum. We learn noting
I might be wrong here, but I don't think this is a good plan at all. Morgrim speaking first seems better, but even then I don't think we can get anything conclusive about it. Have to think about it more though.