WHAT YOU FORGOT IS defender use 70-80% of its force while aggressor use around 30-40%.plus you completely undermine Indian Air Defence,SAMs etc..its not easy for China to muster that kind of force using only handful of air strips in Tibet while India has quite a lot.plus,if you take into calculation of pre-emptive strike to disable Airstrip,then PLAAF couldn't fly from unconventional airstrip.now,if you calculate modern 4th gen jets and not some 3rd gen crappy jets both IAF and PLAAF is using,IAF too is consistent in this sector.we don't need Super Sukhoi or Rafale right now to prevent an PLA invasion.even present force is enough to deter that.the question is if its enough to deter both Pakistan and China.remember,neither China deploy majority of its strength at Indian Border,nor India does so.on paper,even Chinese force can look good against USA,but is that enough??neither battle can be won on these strength which looks good on paper,nor using fancy toys..its strategy which generally wins it.
one example..against Vietnam,Chinese force had massive superiority.but they couldn't even force Vietnam to pull out their main force from Combodia,let alone defeat it.so,thats your clue.