-training chamber tunnels are only temporary relief from light show. so if the gathering hall spider tracks take away light show temporarily also, then why bother going all the way to training chamber? spider tracks would be murderously hard to get to, especially with the game at 1/5 speed!
-and if you come from training chamber to gathering hall, the transit tube will still be loaded and mean that any IS will place you in the transit tube cannon (which, according to your experiments, doesnt even function like a real cannon so its worthless for MBI) and not the gathering hall cannon
-maybe it wasnt clear in my post but even if the bomb slots are both inactive, you'll still pick up the missile expansion. i mean yeah gathering hall might work somehow but my goal for wanting MBI at all is to work on that low% dark suit skip so the missile kills that. similarly, i think in gfmc it would be easier to navigate to the second missile launcher (after using 101% glitch for your first one) by the item sound and have that cutscene take away the light show, but that would of course add a percent. so we're stuck with that damn map station
-and if you come from training chamber to gathering hall, the transit tube will still be loaded and mean that any IS will place you in the transit tube cannon (which, according to your experiments, doesnt even function like a real cannon so its worthless for MBI) and not the gathering hall cannon
-maybe it wasnt clear in my post but even if the bomb slots are both inactive, you'll still pick up the missile expansion. i mean yeah gathering hall might work somehow but my goal for wanting MBI at all is to work on that low% dark suit skip so the missile kills that. similarly, i think in gfmc it would be easier to navigate to the second missile launcher (after using 101% glitch for your first one) by the item sound and have that cutscene take away the light show, but that would of course add a percent. so we're stuck with that damn map station