I will try to post diagrams later but basically the idea is to emulate bringing in an extra linemen who reports as eligible but avoiding the substitution which would make the referees stop the play to give the defense time to bring in an extra defender to counter the extra lineman.
The full layout would be like this:
Code:
WR_______B__T__G__C__T___TE
_____WR__________QB___________WR
_________________RB
You now have 5 potential blockers (not counting RB) on the overloaded side and 3 (not counting RB) on the short-side.
The whole point though is to create a mismatch with already-on-the-field personnel.
Depending on whether the shift was to the weak or strong side, the line could slide on the snap away from the oncoming rush or the TE or RB could run interference. This would depend heavily on the defensive alignment.
With the TE on the edge covering the short-side (T)ackle, you could use him and/or the RB to create a barrier on the backside.
You could also let the rushers think exactly what you think, "Hey, I get an easy run to the quarterback" and have the running back swing around them and (again, depending on whether it's weak or strong side) could have a lot of open space to run after a pass.
It's not really about creating confusion on defense although that would probably happen every so often.
The goal is to overload one side like you would with bringing in an extra lineman, but doing it on the fly without giving the defense time to adjust.
So, for example, if you run to the overloaded side, you could essentially create your own variation of the "tush push", but again, that would depend heavily on how the defense lines up with their base personnel.
If the defense shifts over to match the overloaded side, then the QB slides to that side on snap, but then throws back to the RB or TE if the short-side rush passes by them trying to get to the QB.
That would also be a good line-up to run a WR jet sweep against the overload and slide.