Aqua & Sapone actually was excluded because they signed Di Luca in 2012 and intended to sign Rasmussen in 2008.RCS are no strangers to pressuring teams to not bring a rider they don't want, like with CCC and Rebellin. Whereas Di Luca, Scarponi, Pellizotti, Basso, Vino etc. were completely fine.
Rebellin & Schumacher both had to be left home by CCC. Although Schumacher initially was told to be fine to start the Giro d'Italia.
Di Luca kinda tricked his way into the Vini Fantini 2013 Giro d'Italia squad. Initially Scinto didn't want him to be part of the team. But sponsor obligations forced him to include killer. Sinkewietz would've been okay though, without his positive test.
Hondo was left out by Androni Giocatolli. Although that might have been due to building the 2008 Giro d'Italia team around Gilberto Simoni.