There's a lot to unpack here.
First of all, you don't score 15 goals and put up 31 points in a playoff run while being a passenger. Hell, the Penguins don't even get out of the second round that year, if Crosby doesn't go God-mode against the Capitals. Crosby didn't put up big numbers in the Finals because he was matched up against Zetterberg, Lidstrom and Rafalski, while Malkin took on inferior match-ups (including an injured Datsyuk). But, based on adjusted stats, that post-season is the second most impressive offensive playoff run in the last 20 years (and probably only behind Malkin, Thomas and Giguere overall). And that's not really up for debate, given what the Penguins had to work with in 2009.
Which brings me to your concept that the 2009 Penguins would somehow "cream" the last two Cup-winning rosters. In 2009, Crosby and Malkin more than doubled the production of the third/fourth highest scoring player on that roster, which was a two-way tie between Ruslan Fedetenko and 39 year old Bill Guerin. Crosby, himself, was lined up with Pascal Dupuis and Chris Kunitz, neither of whom would be first liners on a contender (Dupuis might not even be a 2nd liner on some teams). Their two best defenders were an aging, past-his-prime Gonchar and a sophomore Kris Letang (who was still several years away from becoming a #1 defender). The rest of the team was all depth players and journeymen. It's probably one of the more underwhelming Cup-winning rosters in recent memory. The reason the Penguins had success in the mid-2010s was because they finally had the depth to insulate Crosby and Malkin. The 2009 Penguins would only be able to compete with the 2016 and 2017 versions of the Penguins because of a prime Crosby/Malkin.
And where are you getting this notion that hockey is easier play than it was 10 years ago? Or that Crosby used to have a "harder time", even though he tore the league a new one in his early days and captained his team to multiple Finals? Scoring was actually lower when the Penguins won their back-to-back Cups than it was in 2009.
Honestly, you're just so offbase that it's kind of odd...