Unpopular question: Is doping a thing again?

This is not a witchhunt, just something I cant get out of my head. Please throw in your two cents, be reasonable.

Right now there is a dominating team in Europe, their success is based on a decade of good magagement and well reasoned signings. They brought good coaches to the world class lineup and they may claim their last 4 years is the most successful years of football for any club ever. Everyone understands the amount work put into the team, noone is arguing that away.

I see why this team is at the top right now but there is something I do not understand. They seem to have a better stamina than everyone on the planet. After running head to head in the league until the last matchday, they can outperform teams which had a much easier end of season fixture in the CL finals. Since teams usually care a lot about CL finals this seems odd to me. And they do it for the 4th consecutive year, which in todays football is unprecedented to say the least.

They rely too much on stamina. Most of the time in the last two seasons they won matches at the last minutes, when the opponent ran out of breath. It might be just a coincidence but what top1 world class team relies on waiting until the last minutes to win a match? Seems like the team is confident that their stamina and durability is better than the opponents'...

Do you think its possible 'this' team uses legal or illegal drugs other teams cant or wont access or afford? Do you think the performance in the last few years brings up questions or is it just me?