When you crossover a speaker to another speaker, in this case a 10" Dayton to a Morel 1 1/8" tweeter, you want both speakers moving in the same direction at the crossover point so you don't have a null in the response (dip). Kind of like being out of phase when you hook up one stereo speaker cabinet in a stereo set-up + - and the other speaker cabinet - +. Both the 10" and the tweet are moving in the same direction at the frequency where they are both working (the crossover slope). I hope I did a decent job of explaining.

If you can find a wood worker to cut a hole for the midrange (using a router so it can be flush mounted)you could use the Lyra crossover and the Dayton midrange with the 10" Dayton and Silk 1 1/8" Dayton tweeter and not have to worry about crossover design, just use Wayne's.