A Marte call-up really throws a wrench into the lineup shaking it up but I think it is a good thing at this stage with the offense as stagnant as it has been. Anytime you can reach down and call up your #1 prospect should be reason for excitement. The lineup could go many ways now. Definitely see Votto as the odd man out here and Stephenson less playing time at DH. If it were me, as the roster stands today with the current injuries factored in, I would go with LF Steer, CF Friedl, RF Benson, 3B Marte, SS EDLC, 2B McLain, 1B CES, DH Votto while they are out India & Fraley. If India comes back at all this season which I'm going to assume is a possibility he does not with the timing of the Marte callup, then India should get DH at-bats and not further risk injury playing the field.
As far as Fraley, he would likely go back to RF and Benson to LF. Leaving 1B AB's up to CES, Votto & Steer and all will fight for AB's at DH with India too. Steer and CES deserve to start everyday but we are now at this point where the Reds backed themselves into the corner with so many infielders and will be up to them to figure out how to fairly disperse the playing time among all of them. Simply not enough room for everyone. Stephenson's struggles definitely makes him the odd man out at DH which is not a bad thing given he is not hitting much at all and isn't the best defensive catcher. Sharing his duties with Maile who handles the bat surprisingly well for a backup is a fine approach.