I think main way would be to decide on how Everton will play from now on. Both in general sense and under Moyes. These two obviously should align, but point is there should be some general guidelines so that next gaffer doesn't expect completely different types of players. This is pretty much what Brighton seem to be doing.

Differentation could come from building the data models to specifically look for best fits for this. If I was doing the software I'd try to develop some sort match value, could be from 1 to 5, a percentage, what ever works best. There are probably hundreds of parameters available for a model. Developing this model would probably cost from half a million to million quid. Updating is much cheaper and obviously only needs to be done twice a year. Even though it sounds expensive it's peanuts if club makes one good signing or avoids a bad one.

Then search for a player for a certain role and sort by this value. Pick the top, say, five candidates plus couple down the list that someone in footballing side thinks could be an option. Have people analyze these players and see how it all matches up. Refine the model like this. Eventually club should have a pretty decent tool to quickly search for potential players which hopefully unearths suitable ones no-one thought about and are available to us. Again, Brighton is good at finding this type of players, but I have no idea how they use the data.

And not only does it point to potential signings, it might also flag players club is interested as potentially not being a good fit. This would at least lead to more scrutiny.

This would be useful simply because there are several thousand players good enough to play in the PL, at least if given the right role. PL itself has around 500 players plus most of the players in the other four major leagues, plus many players in the next tier, less so in tier three leagues but some etc. So it's impossible to go through all of them at this detail.

Data is just data. It's what you do with that defines its worth. It would be interesting to know how far clubs are with it, probably all that I just wrote is done by most if not all big clubs already. Although I suspect in our case if it is done it's a relatively new thing since we don't seem to have a style.