Yes it is cheaper. But the question is whether the Chinook fulfills the ASQR. It is obvious that the ASQR was fulfilled by both helicopters because both were selected for the L1 bid. So, in this case the added advantages that either helicopter brings may not be a factor. Once ASQR is fulfilled, the cheaper chopper wins.
Now, if IAF is actually happy with this, that we will not know unless they tell it to us. But at the same time, MoD has to be fair to the competitors too.
So, if a pickup works out fine then why buy the truck?
Like I have always said, the services decision is the best decision. Live with it. It does not matter if it is Russian, French or American. They have first hand knowledge on what they need and will buy what best fulfills that need.