It reminds and old thread of mine
The Hydra is a scout, the Chimera is a stealth fighter and the "uber-fighter" you kept refering to is the Gorgon.
I think the Dragon would have been poor in a INFR1 environment. Most missiles can take it out with a single shot and primaries would have a similar effect. Keep in mind that both the Scorpion and the Shaitan, which didn't appear in the main FS2 campaign, have improved statistics. The original FS1 Scorpion and Shaitan wouldn't survive more than 10 seconds in a INFR1 environment, I'm pretty sure of it.
I don't remember if the Dragon is included INF SCP, but you will find it in INFA SA(the Dragon is a must have).