They have the original scuffle in which we just see a bunch of people scrapping, someone yelling get that nigga and hearing a gun going off on tape. Next thing on tape is Tax running and Troy chasing shooting on tape. That's what's on tape.
The DNA and Florida gun purchase are slam dunks to the Gun Charge, not the Murder which why he copped a plea asap, that can't be debated or defensed. If they had the clear shooting footage on tape he would've been indicted for the murder the same time he was the gun charge. That would've been all they needed to charge dude asap w/ murder. Gun charge came in January when he got bagged. Murder indictment was July. Which indicates witness' statement came afterwards to have enough to hit him with the murder charge.
Corroborated means to confirm someones original statement, who statement are they confirming? Common sense would be it's Troy's especially if Troy is bold enough to detail the murder in song and animation. He's on the stand, Tax is across from him in the vid what do you think that implies? It would be his statement who the other witness' are corroborating.
But I'll be back when all the shit comes out in court I'm not going back and forth anymore over obvious shit.