LCA will carry not a single Brahmos, no matter in which version. The centerline can't carry such long loads, the wingstations doesn't have the weight limit, nor does it make any sense to use such heavy loads with a single centerline fuel tank on a light class fighter. We shouldn't make LCA better or more important than it is, there is no need for it to carry heavy loads when you have so many bigger fighters in the fleet. Even in the navy, it will be the Mig 29K that is aimed to carry larger missile, but if that's possible from a STOBAR carrier needs to be seen though.
Because IAF doesn't have this capability at all so far. The longest range weapon is the Kh 59, but other than that we hardly have credible stand off range weapons in the pack so far. It's disappointing if we didn't add Scalp for the upgraded M2Ks, we badly need CM strike capabilities.