There is more to it than that but Liverpool's squad was nowhere near good enough to win the league and Suarez almost single handedly won them the title regardless.
OK, they didn't win it but he clearly made a difference to them, when he left they weren't as good. Of course a player like that makes a difference and it would have made us a difference to us last year.
Whether it would have made enough difference to win us the league is obviously something we can't know, it's almost pointless debating it further.