Final Goku tenshou was the guy I mentioned about the "Zero issue".I read his post and got convinced that yeah,there was something fishy going on.
And he even put a better issue.Why would Jellal go without Meredy?Weird.Also,he knew he was being targeted and possibly watched,but he didn't approach fairy tail.
And yes.When Natsu began to have a harsh talk with Jellal during the battle against Zero,Zero said he was displeased and then cast dark capriccio,which a weakened Jellal tanked easily....Zero could have done a surprise attack,but he didn't.Zero may be a piece of shit,but he doesn't do ambushes.He is really prideful.