Based on your photos you have a pretty wide range of stuff you take.
Buy both 7DII & 6D for ~$3000 (get refurb 6D from Canon store)
-Take 7DII when you need reach, framerate, and/or 1DX-quality autofocus - birds, wildlife, etc
-Take 6D when you need ISO 6400, do landscape, or want thinnest DOF for your shot
You have a heavy wildlife focus so I think having a "pro" APS-C camera is a good idea for reach (and macro) & the best autofocus, but in those scenarios where you need high ISO or want thin DOF you can use the 6D which will do a much better job than the 7DII in those areas. 5DIII would be spending a lot of money for a camera that will not have the FOV/reach you would probably like for your large amount of wildlife shots; you will probably find yourself being forced to excessively crop in post. But if you get this 7DII+6D combo, you can bring the appropriate camera (or both) and use whichever makes sense for what you are shooting at the time.
Want crazy reach? You got it, 7DII. Want high ISO? You got it, 6D. You can't have both crazy reach + high ISO with the 5DIII alone unless you are prepared to spend $10k+ on a 600mm, 8.5lb full frame lens - but if you get the 7DII+6D combo you can simply use your 7DII when you need reach and your 6D when you need high ISO. Best of both worlds without having to spend $10k on a single lens or being stuck having to crop in post every long subject you shoot (plus having the ability to actually see and frame far away subjects in the viewfinder).
In addition to the increased flexibility of both APS/APS-C you will as a side bonus then have a backup camera!
Sell tokina. Sell Canon 15-85. Note its good to get all EF/fullframe lenses if you go this route so they work on both bodies.
Buy Canon 24-70mm f/2.8L II - will have different FOV depending on what camera body you put it on (7DII or 6D). Since you will likely use the 6D for landscape, the wide end of this lens would be perfect for that - then when you put it on the 7DII you will get a bit more reach on the tele end which you'd probably want for your wildlife subject matter. 24-70mm f/2.8L II is also unique as it has minimal coma wide open so its great for stars.
Future buys: Canon 8-15mm f/4L Fisheye; Canon 16-35mm f/4L IS; Canon 70-200mm f/2.8L IS II