>>> i have been doing research on this tool and this tool teaches kids the inside path to the ball and i was wondering if this was a good thing or a bad thing if the batter uses rotational hitting mechanics. <<<
You ask a very important question -- is an "inside path" necessarily a productive hand-path? A more linear path is "inside the ball" but produces little bat-head acceleration from the pendulum effect of a CHP. This may not be important when swinging a short tool with a light metal barrel. However, it becomes increasingly important as the bat approaches -3 weight distribution. --- A linear hand-path drives the knob, a CHP swings the bat-head.
We addressed the "Insider Bat" in a couple March threads. Below are links to those threads.
Batspeed vs. Slaught theory