Just my thought but L isnt watching the ball anyway. Trail is watching ball on throw-in and L is watching off ball. If lead knows who ball went off he may not be watching what he is supposed to do. Where is the ball going on a throwin?
Being on the side of the paint with the ball is just anticipating the play. With Lead there at baseline where the play is most likely ending up looks a lot better than calling it from the other side of the paint or having trail call it.
On a throw-in from the side nearly all the players go that side of paint you still have ref-players-ref, you acually have a better chance of prvent officiating because the big guys who are jostling for position are on the ball side of the paint.... you get better lookat at the picks, and the crap by getting over there to watch it instaed of you being on the other side of the paint another two or three plus steps away from all the plays.
This is a strong side mechanic and the coverage for the throw-in isnt any different than if L goes to strong side for anyother reason. Or even if the ball goes OOB above FT line when Trail has the primary call on the OOB on the far side.
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