Volta's speed is always slow. Climbing speeds are just a little less slow.
The last time a middling WT espoir competed for the GC, Krists Neilands, he only missed out on a top-5, most probably the podium, due to a tactical/positioning mistake in a cat4 climb.
If Matteo Jorgenson was racing and in form, he'd be a huge headache to the Portuguese teams and a favourite. Abner is too inexperienced and raw, they'll likely have him going for stages.
Maybe passport violations aren't included because it's not explicitly failing a test?
Without knowing this exact protocol, that's very unlikely - these protocols tend to be pastiches of UCI/ADR regulations and adverse passport findings are cause for team suspensions there.
The most plausible reason is what Pinto claimed at the time his suspension was announced (that the findings refer to 2016 and 2017 before he rode for W52) - same reason why, unlike Vini Zabù, W52 wasn't suspended by UCI for a month - check the commentary to Article 11.3.1 re: cases arising from Passport findings on the UCI-ADR protocol.