User blog comment:Miskos3/Fairy Tail 531: Pegasus vs. Black Dragon/@comment-25111584-20170415053108/@comment-25111584-20170415120833

Not clever != Stupid Reasonable != Clever
 * sighs*

Not trusting Anna == Basic sense != Clever Jellal's current state == Desperate Go along with Anna's plan without trusting her == Reasonable Desperation

(Depending on nature of precautions) Take precautions against betrayal by Anna == Clever Mention distrust without being practically any different from Erza == Complacence

Why mention that she is not trustworthy if he's not going to do anything about it? To later crow that he suspected it in case his suspicions prove correct?

At best it won't do anything, at worst it could have caused a viable plan to fail.

Ummm... no. At worst, it could result in anything in the world. Better the devil you know and all that crap.