"passive" run block tech

Coach, a former opponent (whose coach has been around, and successful, for decades) made a living at running a weakside offtackle power play against a 50 D. In scouting them, we determined they were doing exactly what you're saying, with the weak tackle. He would take a short lateral step with his outside foot, which (1) got him in position just outside of the 4 tech and (2) invited the 4 tech to take an inside charge. The weak OT would then just drive the 4 tech toward the center, the direction he wanted to go, and a huge hole would open up off tackle.

Prior to last year when we went to zone blocking, we ran a man responsibility iso scheme to the strong side (the "lead" scheme you described in your post), and since we were undersized, we did exactly as you suggested. Taking from what I'd seen from my former opponent, we had the PST take a short lateral step with his inside foot, which (1) got him in position just inside of the 4 tech and (2) invited the 4 tech to take an outside charge. Then the PST would just drive the 4 tech out, the direction he wanted to go (if he was charging very hard, we would actually ride him by the play like a pass block), and we had some gaping holes up the middle.