quite logical, after all Mig 19 should be far more easier to reproduce accurately, without needing extensive avionic stuff. Think about it, if the Super Tucano were about to launch now, that could mean that the first full glass pit plane is a prop one, which is sorta hilarious, and interesting, however, Mig 19 being as it is, a cold war classic, a plane that can be done at highest standard without "confidentiality problems" and sure revenue, a lot of us love MIGs (me too), and also will help in a better, or at least more agile development, for the Super tucano. Win-Win