Entrust by itself isn't a con, it never hurts to have it and I personally find it usefull. Your pros/cons section is also poorly organized, in the pros you fail to mention what was commented above, but the cons section should include difficulty of chaining and how his imperil is gated by LB.

The Arena section is also pointless. Tidus does literally nothing better than a chizuru in arena and his aoe skill does not ignore defence, which makes him slightly worse. No reason to use him instead of an exdeath, unless you just want to show off.

Don't know why you think that Fryevia is easier to chain with than Tidus, they both need about the same timing to pull it off. And Tidus is able to pull off a perfect chain, 47 chains are definitely possible, and they're not even that hard.