I've been doing a bit of thinking on the subject and, to get back to my original question, even if it did power share, it simply wouldn't be worth while to use it over the sigil of devoted. That's of course only talking as a DC and not as a DPS class. The ~ 10% power gain just wouldn't be worth while to toss on and share a…
Honestly if you have enough spare AD to skip from having a lesser weapon enchantment to having at least a perfect that's the main thing I'd consider spending my Ad on.