That's not an issue, existing IAF Mi-35s are co-deployed with IA formations and are under the IA's full battlefield authority over the attack helos. The IAF's attack helo SQNs are well integrated with the IA.
The IN has entirely seperated itself from any other branch and is expanding their aviaton arm entirely in-house.
The first shots fired in Operation Desert storm were by US army Apaches taking out Iraqi radar sites, the IAF is very much interested in this role.
The IA has 90 Rudra on order.
Of course, it will be designed to their specifications just like the ALH, LUH, LCH and IMRH and will have automatic orders from the outset. The Indian military won't be sitting still, for the forseeable future they will be expanding just as the defence budget grows (considerably after the 2020).
A minimum of 39 Apaches are promised to the IA but they would like 50.
This deal is making use of the follow-on clause contained within the IAF's Apache deal, 6 Apaches will allow the IA to kickstart the training and infrastructure development for 3 SQNs (1 each for the Strike Corps) whilst the larger deal for IA Apaches is worked out seperately. It was impossible to meet the IA's demands in full (39+) with the follow on clause, this is a good comprimise and a surprisingly dynamic decision from the MoD- by the time the IA's full Apache order begins landing in India they will already be well versed in operating the Apache.