You cannot say Hendo is better than Alonso (because it would be incredibly inaccurate), because on is a dm and the other a cm or am.
I mentioned Henderson because that is who he would replace, we already have a dm in Lucas, Alonso isn't a DM we need anyway, isn't his philosophy not to tackle. It's pretty obvious that our 3 midfielders would be Lucas sitting in front of the defence with Alonso and Gerrard in front of him.
Where does that leave the likes of Allen, Henderson and other youngsters trying to break through. It means yet another foreign obstacle in the way.
So far since Rodgers has joined the club, 12 British players have been sold, 7 of which were academy prospects. He's only signed 2 British players and one loanee. Meanwhile 10 foreign players have been signed with 2 loanee's as well.
If you look at the best Premier League teams over the years, that isn't how you do it.