You should cut off near the floor ( right below the first Tee) and start over.
That dishwasher connection is totally illegal and dangerous. Even if your code ( which apparently is quite lax allowing the studor vent) allows no air gap, you do not have an adquate HiLoop.
Plan on running the dw drain line into a HiLoop and then into the side of the disposer.
Best way to do this is get a large basketfull of fittings...baffle tee, trap, couplings, 1/8 and 1/16 bend, etc. Put the disposer on and work upfrom the floor fitting things in as you go. Take all the unused fittings back to bib blue or big orange.