Well from various Chinese sources. Yes all assets can't be deployed by China. But China's production level plus the money it can spend on training and test its weapons over and over again is pretty much unmatched in regionIts not only about number of Fighter Jets dear. The Air Bases close to India matters too. How many Airbases China has closer to Aksai Chin and how many are NOT build on upper altitude thereby negating Full payload carrying capacity? Also can China risk by deploying its major Aerial assets with India when US, Japan, Taiwan are in SCS? Third from where did you get 150 J20 number?