As has been well apparent for several seasons now, our team has suffered immensely in big CL games against strong opponents, who safe in the knowledge that Messi was the only genuine threat, focused almost everything on him and many times succeeded in shutting him out. This has cost us numerous and painful eliminations to lesser sides. The reason why we are now on the cusp of a Treble is two-fold: Neymar & Suarez. End of story. Forget about all the little stupid things we say about managers, tactics etc. It's all secondary at best, and so much noise at worst.
Lol.
We played shades of Tiki-Taka in the last couple of Seasons and everyone knew how to neutralize Tiki-Taka after years or trial and error.
Tiki-Taka was unstoppable in the beginning, later it turned into a crap.
Rijkaard's Barca played the same as Lucho's Barca.
It was unstoppable in the beginning, 3-4 years later we were neutralized much easier (ok, some other factors also helped, but still...)
While we really have a much better attacking trio today than in the past years, there are a lot of other factors, which you call as secondary, like:
1. a new coach
2. a different, direct tactics
3. some new midfield players, like Rakitic
4. more depth in the midfield, defense and on GK's position
5. less injuries
6. better physical shape of a team due to some of the reasons mentioned above
7. players with more height and muscles than in the last few years due to Mathieu, Rakitic, Suarez, for example
If we played Tiki-Taka like from the last 2-3 years, then all Messi's-Suarez's and Neymar's of this world wouldn't help us.
Especially Messi on a false 9 in Tiki Taka in the current era.
But if you want, you can put the whole emphasis of success only on MSN trio, no problem.