Billy,

You said: In lurking on this forum recently I ran across a discussion on here that covers that brigade, it was the one with Middleton Johnson's 14th Texas Cav. Regt. (dismounted) and supposedly was to have the 15th, 16th and 17th Texas Cav. Regts. (dismounted) as well, the brigade that the ORs don't list a commander for. Unless I misread the discussion am I correct to say that the 14th was the only one of the four that made it to Corinth? And the other three regts. were diverted back to Little Rock instead?

Yes, you are correct. The rest of the Brigade remained in Arkansas.

4/24 Van Dorn's orders [#64-issued 4/24 from Memphis] states that the 14th-15th-16th-17th Texas cavalry regiments are to be dismounted with the horses left near Little Rock in preparation to joining his army. All but the 14th Texas were subsequently detained in Arkansas due to the crisis [in May] that developed after Van Dorn's departure.
Due to high water the regiments were delayed several days in getting to Pine Bluff. Before they arrived, Federal General Curtis made threatening demonstrations in N. Arkansas so these regiments were ordered back from Pine Bluff to Little Rock. However, some of these units continued to be carried on Van Dorn’s tables of organization for several weeks in anticipation of their arrival.

5/5/62 HQ Army of the West, Camp McIntosh, Maury to Gen S Jones-If practical, make such change in the portion of the encampment of Griffith’s Brigade as will enable Gen McCown to encamp his Div together in proper order. The arrival of Johnson’s regts of McCown’s Div makes it more important to attend to this at once.

5/5 HQ Army of the West, Camp McIntosh, Maury to Col S E Moins cdg Johnson’s Regt Tex Cav-please report at once to Gen McCown cdg Div & be ready for instant action.

5/7 “We [14th Tex DC] were transferred to Cabell’s Bgde, Van Dorn’s Div"