1) the Sathanas jumps in perfectly enough to be in range of every single ship it is hostile to
The Shivans occasionally did precicion jump in FS2, so it isn't that unlikely.
but far enough a way that none can maneuver out of the way.
Please show me any capital ship that can go from a standstill to a speed high enough to escape the Sath forward firing arc in less than 10 seconds!
2) The Sath will hit with all beams on the first salvo. Play Bearbating again, and sometimes the Phoenicia, a comparatively flimsy Hecate, will sometimes survive with hull left over (not often, but enough). Titans and Raynors are both more heavily armored, and hardly likely to just keel over like you want to think.
As was explained before, that ship is scripted to survive, even though that doesn't always activate in time safe the Pheonicia.
3) You're straight up ignoring that Sath vs. pair of destroyers has already been played out, and the destroyers won without any losses outside of fighter craft. Tongue
No I'm not ignoring it, but it seems you are ignoring some important facts about that mission.
First and most important, the Sath was stripped of it's heavy beams before it came in range. Oh btw. I just remembered something. One time I was too slow and the Orestes was hit by a single BFRed once. And it was down to about 30% hull, so yeah, two BFRed hit will kill a Raynor for sure.
Second, the destroyers were facing the Sathanas. If it jumps in on top, on the sides or behind them, they'll have to turn before they can fire their main beams. The thing is, it's unlikely they survive long enough to do so.
Third, even when facing the de-toothed Sathanas from the start, they still needed a bit of time to destory it. I don't remember exactly but let's say two minutes, though I'm pretty sure it was way more.
Do you seriously beliefe that they can survive several minutes in the forward firing arc of a Sath?
Edit:
I just tried a little FRED experiment. I put a Sath against a Raynor, Titan and Orion refit and was even nice enough to let the GTVA face toward the Sath.
Even without any scripts the Sath fired two beams each at the Raynor and Titan, destroying them in her opening salvo, though I underestimated the lifetime of the Sath beams... The big exploding started at 12 seconds into the mission.
Because it was unscripted, the Sath continued to fire at the exploding ships and so the Orion refit was only destroyed 48 seconds into the engagement.
Edit2:
With a little bit of scripting (like the Sath opeing up before even clearing the jumppoint) the whole battle was over in 20 seconds....
If you'd like I can attach the mission file, so you can see for yourself.