I think current IAF chief made his intentions clear quite a few times. I would not be surprised if the delay is due to that, ADA/HAL would be happy to make it if Govt released funding. That funding came just 3-4 months ago. It won't be out of place if many years down the line we find out current ACM very much opposed desi jets and tried his best to derail projects. Remember RKS Bhadauria sir was not this against ADA projects & now being industry head in UP he is actively coordinating. But current ACM seems to be infighting, hence Govt/PMO/MoD definitely spent time on that issue, so fund release got delayed. Until this current ACM leaves his post & someone more inclined with Govt view I can see problem persisting. Capex not spent is an indicator how some procurement are stuck in files due to this internal politics.
This is just my view btw.
I have noticed government selects the person needed in their area of thrust.
For example Army chief , Engineer when we spend infrastructure development.
I feel MRCBF will be done.
When Airforce plans anything major, it ll be new chief.
Just my thoughts.