lol...IAF didnt replace 841 mig 21 with tejas...coz we face delays after delays. otherwise ideally mig 21 should be retire near 2005-2010.
by the way its not necessary we hv to induct 841 tejas to replace 841 mig 21. coz tejas hv many capabilities nd technology better than mig 21. beside this we also bought 272 su 30 mki also. u cant compaire one su 30 mki with one mig 21.
but in su 30 mki replacement...u r suggesting it should be replaced by another 4.5 genration aircraft

. keep in mind AMCA 6 squads r not replacement of su 30 mki. but addition of indian squads number to reach near 42 squads.