Mk1a fullfill role to replace mig 21 ,mig 27 , jaguar in iaf fleet .
What it can't.do is mig 29 type manuverability but still carry more load that it .
Mk 2 is more of a mirage 2000 replacement , more payload , better range , new AVIONICS , better aerodynamic , more manuverability , lesser maintenance .
Mig 29 can too be replaced by mk 2 , be to be specific , it's really a odd ine out plane in arsenal , we should aim for a mig 35 type specs , which mk 2 gives except manuverability .
If orca ever inducted it would be rafale+ category with higher thrust engine ,it would be more of a eft + rafale combo .
Basically i don't see sense in tedbf being developed in single engine but instead we should look out for loyal wingman now .
At max we should aim for a twin seater mk 2 for mothership role or orca twin seater