As good as Dani is going forward/with the ball at his feet/from set pieces
Is defensive side is very weak, he'll certaintly displace Glen Johnson from the team, and play as an RB, but that wont solve anything, because SWP is on fire on the right of the midfield, but GJ is terrible at the back too, but is handy going forward, but cannot cross, while Alves has him covered with that side of the game, defending, he's the = of GJ, if not slightly >
Wont be too much difference, except for the flair that Alves will bring