I have most of the Essse line and a few of the Adamas fixed blades. The Adamas is my fixed edc. (I carry it in the factory sheath with a leather belt loop I made. For IWB , the only Esses I would use would be the 3 or the Izula 1 or 2 with a handle wrap. If you wrap the Adamas like benchmade shows on their vid , it is a very solid grip and even works well without a wrap if you want it to be thinner.
I wouldn't worry too much about rust with the Adamas. I find 1095 in the Esse is a great steel but does rust easier than D2 .If you did get a little on the edge it will buff right off . I tried the Esse 3 as an edc , but like the size of the Adamas a lot better , and the edge retention and toughness of that knife is pretty outstanding. Wish it didn't have the top serrations . Doesn't cut cord too well even if sharpened up , and only does minor notching in wood.
My fixed edc used to be an original DPX Hest , but the darn prybar on the end got snagged on clothing all the time. Great on a pack but annoying wearing on the hip. I though of buying another one and grinding the prybar tip off ( considered a sin by many) , but in reality with out the prybar pommel would probably be on of the best edc fixed blades out there , Imo.