Alonso played for a club that finished 2nd in La Liga one season. Garcia played plenty of times for Barcelona.
Alberto was at Sevilla, loaned out to a lower league club in Barca B, Barca had the chance to sign him for 4m Euros, turned it down, and now he's at us.
No comparison between Alonso, Garcia, Coutinho, who all played at really high level, and Alberto.