From the above quotes I read only inside left, inside left which is nowhere near the modern RB position you are claiming he'd play at.
That's not Andrade's position that Anto stated there. That was the position of the opposing players he faced. If he's faced inside forwards and shut them down, that tells me that he can do the job of a full back for sure, particularly given his athleticism and defensive nous. Against Giggs, however, he'll be dealing not only with his movement, but his dribbling, speed, and trickery on the ball. Giggs was quite tricky to deal with even from a standing start, so it won't be easy for Andrade to fare against him, especially since Giggs at his peak was tough to read and manipulate.
Overall, I can see what Gio's trying to go for, but I'm not sure how well it can really work out. Bozsik and Souness isn't enough against the opposing midfield. Iniesta won't track back, and he won't do well enough in his pressing approach by himself let alone really offer something defensively. Bozsik, whilst he is a decent tackler and good positionally, doesn't have the work rate to keep Gio's midfield defensively solid enough, particularly with the opposing midfield having more energy, movement, and graft in them overall. Souness himself will struggle to do that much running in what is essentially a 2-man midfield setup against such a fluid, energetic midfield.
On the attack, Gio's lopsided approach could work if they could show that they can dominate possession and push the opposing team all the way back, but that team isn't facing a bunch of mugs. Still, though, there is potential there given that Bozsik and Souness are very good on the ball, particularly Bozsik, who's excellent at retaining possession under pressure. Effenberg won't simply be able to give Bozsik a tough time with his aggression, and if Cruyff tries to double-team him, then Souness gets the space to play some dangerous passes. Zico himself is also quite mobile and will give Gerson and Effenberg a tough time, particularly Effenberg, who's more aggressive and tries to win the ball quicker without caring about the spaces he opens up.
I don't think Gerson and Effenberg are a good partnership as Effenberg isn't that defensively astute, just aggressive and able to cover a lot of the pitch with his running. He's like Vieira in that sense in that both weren't really positionally astute and not aware of the spaces that were open around them, just aggressive, strong on the tackle, and effective ball winners. Compare Effenberg to Gerson's midfield partner in the 1970 World Cup, who was more disciplined and considerate about the dangerous spaces around him. In this case, Gio's approach can really test Enigma/MJJ's team as Iniesta and Zico's movement combined with Bozsik and Souness' ability on the ball + their vision will allow his team to dominate the midfield.
On top of that, Amoros will have to be concerned about Iniesta. Gerson can't worry about Iniesta whilst there's Zico around too. Given this, Facchetti has the perfect platform to play his game, and I don't see Figo playing like a wing back for much of the match, following Facchetti all the way back. Also, the Amoros-Figo argument is void unless
@Enigma_87 /
@MJJ can show that their team can get control of the match.
For me, I do think that Gio's team has the midfield advantage and, thus, the control over the match. In such a match, Zico and Iniesta will be very dangerous, and those two will make Greaves and Finney more effective. The scoreline will be something like 2-1 to Gio in this match.