and then those personal theories need to be backed up by data. There is no data I've seen in any published study that backs up the theory that most of the power comes from the trail arm. In fact one study that was specifically goaled to find the 'hit' from the trail arm did not find it with skilled golfers (at least not the way golf instructors described it).
BTW - In science most theories are developed understanding the existing data and are unlikely to pass peer review unless they are consistent with the relevant developed data - Einstein's theory of relativity is completely consistent with Newtonian mechanics at non-relativistic velocities. Even so Einstein's theory of relativity did not 'make the big time' until it was proved experimentally (and ocntinues to be proved as for example the corrections that need to be made in the GPS system due to the relative velocity of the satellites).