Not even close. Expecting Rustom-2 to perform as good as a twice as big (5.5 ton) UAV is just unreasonable.
That's not how it works. Reaper is only heavier than the Rustom-2 because it carries weapons, which requires stronger wings and more fuel, hence a larger engine to consume said fuel. Otoh, Rustom-2 has two engines, which provides the same electrical power as Reaper's one engine. And the avionics is the same. The same SAR radar will give you the same data, whether it's on Reaper or Rustom. Rustom can carry an AESA radar instead of MS on the Reaper. And the EO/IR device is also pretty much the same, in fact superior Israeli tech on the Rustom-2. ESM should be similar. More importantly, Rustom-2 will be better integrated with the military comm network.
In terms of avionics, there's basically no difference, with the exception that Rustom-2 is newer so it will very likely carry more advanced hardware. Plus, the transition to newer technologies will be faster than we can import.
Basically, both Rustom-2 and Reaper have the same size avionics bay and can carry the same avionics with the same weight restrictions.
Some of the performance advantages of the Sky Guardian are irrelevant to this. All we have to do is make an Mk2 version, just like the Americans did.
Even today, Only army is the real buyer lined up for Rustom-2 with 50+ numbers anticipated. It will not be replacing Herons of AF or Navy as they are going for upgrades.
What's fine for the army will be fine for the air force. It just depends on when they will free up money for drones after the issue with fighters is solved. Herons have nothing to do with it, drones do not have long service lives in terms of years. Anyway, the IAF is also interested in it, so are the navy and coast guard.
MQ-9B is must for Navy. They will be going ahead with or without other services.
Agreed for the navy.
In fact, it's just 10 each, so it's not enough numbers to interrupt indigenous programs. The navy's numbers could climb to 20+, they originally wanted 22 drones. The Sea Guardian comes with some other equipment which will take time to incorporate into Rustom-2, so that's fine. And we need the Sea Guardian for interoperability with the USN. A Triton order is also expected to follow suit.
The IAF and IA can make do without buying the Sky Guardian though, the Rustom-2 will be enough. A lease is cheaper for them.