That would be pretty useless IMHO. Anyway...
Notice that subspace tracking in FS2 is
pretty useless. The GTVA rarely manages to get any kind of advantage from it at all.
1) I don't think there were GTVA ships at the Sirius node. Command pulled the blockade, remember.
We don't know when Command pulls the blockade. It's worth noting that The Romans Blunder
was originally designed as a red alert mission so it's likely that
's intent is that the Iceni jumps straight from its location in The Place of Chariots
Now if that is the case Command probably were pulling the blockade at the exact same time as they were telling Bosch there was no way they would do that. There was no time for the Iceni to jump out, hold secret negotiations with command and then head to the node. So there probably would have been ships at the node when Bosch jumped out. They just weren't there when the player jumped in.
2) If Shivans track ships through subspace the same way Terrans and Vasudans do, then I have a counterexample. The Lucifer tracked the Taranis to Tombaugh Installation, and we can probably assume there were no Shivans there before the Lucifer showed up.
The Shivans use their own system of subspace tracking. It could work on completely different principles from the Ancient-based version which the GTVA have. Hell even if the Ancient system didn't require a ship at both ends that doesn't mean the GTVA were able to duplicate it perfectly.
Name a single time in the main campaign we see a Shivan vessel leave a fight and then send fighters to attack something without jumping to the same point itself?
I'm not sure I understand your wording, but here are two interesting incidents:
1) Doomsday (FS1): The Lucifer sends fighters and bombers to attack the Galatea before eventually jumping there itself;
2) A Failure to Communicate (FS1): The Lucifer jumps out after nuking the installation, but still sends fighters to attack the communications terminal.
If you read the rest of the thread you'll see I'm on about the Shivans jumping out from a battle so that they can launch a fighter screen for when they re-enter a battle. The Shivans never did anything like that.
I don't see any good reason why they shouldn't but Trashman's entire argument is based upon the premise that the Shivans are such xenophobes that they'd sit there and take it from the Colossus rather than do a pretty similar manoeuvre to the one he claims the other Shivans might have done.
So thanks for butting in and stopping me make him disprove his own theory.