Possibility 1: Madhav is Ehsaas, and Rahul plans to send him -- this is very unlikely because Rahul is completely aware of Madhav's confidence issue. He knows that Madhav would never face Aradhya as Ehsaas.
Possibility 2: Madhav is Ehsaas, and Rahul plans to go in Ehsaas's place himself -- this is unlikely too because this would mean he's falsely giving an image of Ehsaas to Aradhya. If this is the case, then he would already be sure that in today's episode that he was going to cheat Aradhya by bringing out a fake Ehsaas in front of her. Rahul does not seem to be that type of character, so I don't think that he plans to make himself Ehsaas just for the sake of her "uniqueness".
Possibility 3: Rahul is actually Ehsaas, and he plans to go ahead and meet Aradhya -- this makes most sense to me because Rahul was very confident in his self-talk today. He's a confident guy by nature, so he would have no shame facing Aradhya. If Madhav was Ehsaas, I'm sure Rahul wouldn't have that confidence in his tone when he said that he would make sure Aradhya met Ehsaas.
Possibility 4: Neither Madhav nor Rahul is Ehsaas, and Rahul sends the real Ehsaas -- this seems the most unlikely of the bunch, I won't even elaborate on this!