The problem here is you're not considering the athleticism of these sides and why things can play out differently from team to team. Barcelona are not the above; they have different strengths, weaknesses and approach play. Liverpool are not the team an unathletic side want to match up with, and to offset the disparity in athleticism and mobility, Barcelona will have to play them off the park, which is not what this incarnation of Barcelona are likely to do, imo, for the reasons stated.All of this really sounds funny when you consider that Liverpool have only pasted Arsenal once (5-1) this season from all the top 6 Premier League sides. They did not even create 1 chance against United when the Premier League pole position was at stake. They got obliterated by PSG in Paris with only 1 shot on target (from a penalty) when the group was extremely close with Napoli, PSG and Liverpool and they could have gone out. If not for Hazard's woeful finishing or Lloris gifting them that goal, their Premier League title chase would already have ended by now.
This is a Barca side that only lost 1 meaningful game in 2 seasons and that only after winning 4-1 in the first leg and being completely complacent and switching off in the second, so it was their own doing (or undoing) rather than anything else. The record is 101 undefeated in 110 games.
Busquets has coped well and been part of a midfield that handed out some heavy defeats to a 3 times CL winning Real Madrid side with Ronaldo in it in recent years. Think he'll cope well with Henderson chasing him down.
If this Barca can dish out Man United's biggest defeat in a 2-legged Cup tie in 2nd gear, imagine what they can do when they are forced to turn it on a lot more, which they are capable of.
Messi is obviously the X-factor, depending on which one turns up, and if both he and Busquets are on top of their game, things look different. However, I think the likelihood of Liverpool's key players being on their game and executing the plan is higher than Barca doing the same, for me.
Since the draw to the final was made, I've felt Liverpool were the worst possible opponent for Barcelona and I think that's even more the case after we played them.