1. The LCA had to be powered by the GE engine because DRDO or HAL whomsoever you may like to call it failed to develop the Kaveri engine after 25 years of development.
2. You seem to be having some first hand info about Arjun "Every tanker who has used arjun loves it". I usually have information from the press. So no comments.
3. The technology developed by ISRO goes to our missile programme. So whether ISRO smuggled it or DRDO doesn't matter. Moreover if we still have to smuggle a 1990 chip shame on us.