You are not taking official specs into account, which is the first problem, then there are many mistakes in your comparison. The Gripen has not 2.4t internal fuel, 2t at max, it doesn't have the same GE 404 that the LCA MK1 has, it's Volvo RM12 is only based on the GE 404, but with a lot of different parts and different performance too.
The RCS is not dependent on the ammount of composites that is being use, but mainly on external design, coatings... and since all Eurocanards are developed with a very low RCS in mind, it's hard to see many advantages for LCA there and where did you get the power of Tejas radar, when we still don't know which radar will be used in MK1?
The fact is, the Gripen offers advantages in speed, has IFR, the higher payload, and most likely in maneuverability as well.
LCA is developed according similar modern standards (low RCS in mind, modern avionics), for similar roles and at the end will have a proven and capable engine (most likely also a proven and capable radar), which basically puts itself in the same generation as the Gripen, performance wise however, it fits more between Gripen A and C.
However, the main point is, that and LCA with some off the shelf parts could be comparable to a modern western 4th gen light class fighter that was developed by an experienced manufacturer. For the first attempt that would be pretty good and would leave much space for further improvements, the problem is only, that we didn't planned with the off the shelf parts, but delayed the LCA with unnecessary indigenous projects and that's why LCA got so much in trouble, although it has the potential. That's why the most important lesson we should have learned by now is, to make such developments as simple as possible and to maintain a steady improvement curve with increased indigenisation over the years and not from the start!