1) Verbals are just that...same as football. But the number of wrestling recruits are a lot less, so you don't hear about as many. You also have a lot smaller pool of recruits at each school, so the change of a decommit impacting our beloved school is far less.
2) Following wrestling recruiting for a couple years, the trend I have noticed is on average 60-80% of your high level recruits sign early. It is somewhat similar to basketball.
3) Pass - I'm sure other can give you info here.
4) SERTC wrestlers - I'm sure other can provide info here. But the world of wrestling seem relatively tight... there tends to be some connect to get wrestler to SERTC.