KT vs OZ : Flash vs JD

Jeadong starts at the bottom left as a zerg (surprise, surprise), and Flash spawns at the upper right (he gets terran for whatever reason).

Jeadong goes 12 hatch-12 pool, and Flash 1-Rax expands, and scouts Jeadong's third hatch. Jeadong's drones snap this scv few times when passing by, so when zerglings comes to quickly take it down, it has only 20 hp lef! It's worth mentioning, that J scouts with a drone too, finding Flash's position and backing off before marine at the front could pick it off. After killing initial terran scout Jeadong carefully denies any additional scouting, having one zergling in the front of terran natural and three at his own entrance.

To cut the long story short on zerg part, Jeadong goes three hatch muta behind four zerglings. What is most interesting for now, is Flash's build. It goes like this:
1Rax expo
Factory(!)
2nd Rax, academy
Starport(!)+ Ebay
Science Facility (!) + addon at the Starport, and at this timing first medics pops, and stim in the academy is being started!
And so Lair was ready at the time when 2nd Rax just went under construction! We were to see direct tech to vessels vs three hatch muta. Might it work?

Jeadong places his spire at creep of his third hatch, and when his 9 mutas go into air to bring death to all non-zerg (and not-controlled by Tyrant) living creatures, he expands at the bottom right. When JD gets to his opponent's base, he sees overall four turrets total in two spots (he does not bother going to the natural minerals), he makes Flash stim couple of times, making him wasting medic energy, and finds an opportunity to demolish upper two turrets, in the meantime reinforcing mutas to 11 total. I guess when Tyrant realized there is only about 10 marines, he pumped few more zerglings to attack on the ground.

All the marines

Now the most important moment in the game: after loosing last two turrets in the main, Flash gets enough energy to irradiate, and he uses it... in vain!
It didn't last longer than this screenshot

Infected muta dies immediately, so quickly that JD had no time to react against it! In fact, he even didn't realize he was irradiated, as came out in the post game interview![interview] Then zerglings made it to the natural, and it was pretty much over, next irradiate was pointless, and a tank-scv combo doesn't seem to do too well against mutas with zergling support... Flash taps out.

At first glance it seemed to be a one-sided ownage, stompage and fury of Tyrant unleashed at an innocent terran. But I think it was way closer, than it looked like. Why?

What went wrong.
Okay, Flash's gameplan is pretty obvious: get irradiate, deal with muta with extreme prejudice. The thing is, this Irradiate didn't work. Just imagine what would happen should irradiation landed on a healthy mutalisk: JD would be forced to back off and split. He's so good with this, the damage would be minimum, but still, some would be applied, and few second to rebuilt a turret, heal marines, pop two more, two since vessels in the air... and we would see strong defense overall.

Key thing in this built is the very first irradiation, and this time the key missed it lock.

But there was one more mistake Flash did, I believe. Like against Effort in the 5th set of the OSL, he did not walled. Even if first radiation had went as planned, JD had a good chance to attack with zerglings and do the damage, especially if he would take mutalisks with them. I well remember that against Jeadong he did wall and he did win in the MSL just few days later. This wall+bunker (already in place!) would render lings useless in that place at this timing.
But maybe I exaggerate, and marines from the high ground could deal with this treat?

I see Flash's point in this build: with such fast vessels you would simply walk over any amount of lurkers zerg can produce to slow you down, and your push is game-ending, basically. It's risky, it's on the edge, but expect it to be used again, slightly refined and corrected. When it finally works on the stage, it could very well change the face of TvZ.

I shall wait for next FvsZ impatiently!