He didn't touch anything apart the bombs, so the place didn't detect him.
Mack was "infected" when he touched with his bare hand the sign on the ground.

Whitehall is dead, but this is not always a lasting condition in Marvel Comics.

And they worked on Raina hand too.

And ending just before Avenger: Age of Ultron

He just do not want his daughter see him like a hulk-size psychopathic monster ripping limbs out of people.
When he went against Whitehall, and Whitehall pointed the gun at him, he didn't reacted minimally. He probably would spit the bullet after it was fired in his mouth.

So, they count as blue.

Interesting, rewatching the episode, Coulson and crew go to the Garita del Diablo (they translate it "Devil's Sentry".
This support the theory they are entering a Kree Outpost (not Inhuman) and they will, probably, activate a Sentry left by Kree. Krees near always leave a Sentry robot to watch their abandoned bases.

Agent 33 was knocked out two times and two times left alive (not even shot in the knees). But they told may times:
1) Someone is more susceptible than others to brainwashing
2) In some subjects brainwashing is unstable ( Ice guy)
3) Agent 33 showed to be stubborn and took a lot of time to bend
4) Agent 33 went emotional…

She know how to survive.
And with the education the Good Doctor gave her, she is able to survive everywhere.

They will not Tara or Jenny Calendar some character when they put it in harm way. They do it killing them out of the blue.

Fitz never shoot anyone with real bullets.
He is not a killer.

It was funny when he complained he liked his boss all together and in his right mind and then, now, he is the one going berserker.

I got it now:
They are not finding Attilan or anything Inhuman.
They are getting to a fricking Kree base, with a Kree Sentry inside.
The defences are not needed to defend the bases, they are there to prevent an early activation of the Sentry.
If only the evolved humans can enter the bases and activate the Sentry, the Kree…

I suppose Tony know already, just by the fact everyone know about Coulson being alive:

Reina told about the tracker to Agent May(esque) before seeing the other half of her face. If Agent 33 was not stupid, she would had known Reina had a tracker on her.
They just didn't know what frequency/protocol look for.
This is when Ward come handy. He knew what to look for.

Nothing is impossible in the MCU

No.
Now Fits and Simmons are back on synchronicity.
Mack and Bobbi made their job on this.

The writers go backward, they known the end state and build the plot backward until they have the starting of the series.

Mack-Bobbi secret something and Mack die immediately after?
No.

If you watch the first episodes knowing what happen after, you will catch a lot of things people overlook at the time. And this is enjoyable.