A lot of people were saying he was better deeper after he played there against QPR a couple of seasons ago with Besic. However the balance has to be right, he couldn't do Barry's job so would Gana have to do that and Ross play alongside him?
		
		
	 
In my head I think Ross has played in a midfield 2. 5 times the game you mentioned. The derby when Baines  went off at half time and Barry went to left back.  Ross had s great game that day. The arsenal 3-0 at the end of that season when we won 3-0. With Naismith in a false 9 with lukaku and mirralas wide. Barkley played the left side of a 3 man midfield, he didn't do anything spectacular but had a good game. Was very disaplined.
 Not sure if it was the very next game but also played in a midfield 2 v palace in the game we lost 3-2 which all but ended our champions league hopes. He also had a good game and was the one player carrying the fight to palace, especially in the last 30mins. He was unlucky not to score and set up a couple of great chances.
The only other one I can remember was v man Utd at old Trafford towards the end of last season. I think Barry was missing and Martinez played him infront of the 2 centre backs. He was poor on the day. But at that time the whole team was in meltdown.
Don't think long term it would have ever worked under Martinez, with the indiscipline and the full backs bombing on. 
Like you say would need the correct balance of the team. 
Personally playing gana in the holding role would be a waste for me, as he presses higher and wins the ball back further up the pitch.
If you had someone like Carvalho infront of the back 4 could probably work then.
Spurs played eriksen in midfield yesterday, but he had wanyama behind him