Elgey, henceforth to be known as PG because that's how excited he gets me, relies solely upon attacking stats for his points. He is a turnstile in defense (listening to the podcast today and they said in the game against the Broncs over the weekend, not only did his kick get charged down but he then missed two crucial tackles in that same set leadng up to the try). The problem is, with the weighting of the MT points and the amount he accrues each week, he needs to score bulk attacking stats to correct his scores. Maybe behind a decent pack this would be possible (think Milf etc) but Titans have just been crueled so much by injury that I can't see that happening.
As for whether or not you trade him or Jacks kinda hinges on Jacks role at the Storm now with Munster returning. If he doesn't play at all this weekend then no rush to trade him out. The problem is if he gets named as a bench utility and play 20 mins or so and scores rubbish all. I also think Jacks has more potential to cover during SOO and injuries than what LG does to score a decent score.
TLDR - I'd trade LG if you can afford to have Jacks sit on the bench for a week or two and see what happens. Worst case, you trade him in two weeks, best case he doesn't play and you're losing nothing.