I did but that is an interesting plan to capture the Dragon and draw his wrath where it isn't needed. How interesting...
I'm not sure capturing Takashi will do much good. If the old bugger is taken alive, don't expect him to last too long. The guy is likely to commit
seppuku the second he has the opportunity to do so. Ritual suicide removes his piece from the playing board of DCMS honor. If anything, capturing Takashi will help the DC in the long run by giving them something to focus on. With Kurita still alive even the most "adventurous" Warlord might be hard pressed to exercise independence with the Coordinator and the entirety of the Combine's honor still redeemable.
Best case would be the death of Takashi in combat. With the Dragon and his son gone, it becomes a free for all among the Warlords. Win win for Hanse Davion.
Takashi's survival is a partial victory, since the Coordinator's rage at losing Luthien and his son might make him unpredictable, and therefore hurt the DC's war effort further. His survival could also just as easily hurt the FedCom's invasion, but with the DCMS already on the ropes, I think suicidal/rash action on the part of the Coordinator might result in some major mistakes and maybe even some sort of coup to prevent the complete destruction of the Combine by one of the aforementioned Warlords, ISF, etc.
No, either Takashi dies in glorious battle during the planetary assault or gets away. If Takashi gets away and Theo dies, the Coordinator's rage might be the FedCom's best friend.
Capturing Takashi creates a rallying cry and focal point (in either the event of his survival or suicide I might add) the FedCom does not want to give the Draconis Combine. It's not just about the DCMS either. Remember, the Coordinator is the Dragon, the embodiment of the Combine. You want to see an upswing in insurrection, suicide attacks, etc., on Combine worlds? Capture the Coordinator and see what happens.
You only need to look to the Jihad to see how this would play out in the Combine.