Cannot be compared in the first place. Aakash just helps Durga execute her plan. He has no original idea. Also he now knows the entire truth.
Dev as I said earlier also is a defense mechanism and if he needs to be a good defender he needs to know how the attack happens. It is easy to tell doesn't he understand. No in every game defenders practice a lot looking the way the other team's attackers perform.
In cricket videos of key batsmen are observed again and again to have field placements. In football the defenders observe the way the forwards of other team do to block them. Defending is a difficult job and you need presence of mind, agility as well as knowledge of attack to do your job perfectly. In every case glory goes to the attackers, but without defenders they will not be able to win.
So if Dev needs to be of any use to Durga he still needs information. Key information on how he was attacked by Shaurya and how even Durga played with him. Regarding Raj and Sakshi he has some fair idea by now but not Shaurya.
Unless that info comes to him he cannot be of any help to Durga. Durga attacks but she doesn't have it in her to defend the unexpected moves. Even before Dev came it was luck that saved Divya as Sakshi was miles ahead of her in the plan. Again marriage Durga had nothing to defend herself once Shaurya rejected her.
Whereas Dev is shown surviving any direct attack on him. Whether it is car chase, Raima case or prison fight he is able to defend himself. He fails when attack happens from behind. Unless Durga who knows that warfare helps him with information he cannot do anything. And without defense Durga will fail also.