A 31 year old Stastny lit the nhl on fire, averaging 1.46 ppg. When he was 33, he still averaged around 1.2 ppg. Marcel Dionne was an excellent point producer until he was 35-36 years old. These are simply excuses.
Did the 31-year old Stastny have to adjust to a completely new lifestyle and way of playing hockey at that age? No he did not since he had gotten the chance to do that at age 24 when he was young enough to make that transition more easily. It is far easier to adjust to a new league and a new culture when you are young and still improving as a player than when you are older and already on a steady decline.
Considering that when Makarov and Stastny played on the same continent as each other Makarov was a better player than Stastny both before and after the 80/81-88/89 time frame I don't see why it is so hard to believe that he would have been superior during that time frame as well.
Makarov had already achieved more success in the European game at age 21 than Stastny had at age 23 after his last season in Europe (79/80). Here is a comparison of their voting records up until that point for example.
Domestic player of the year voting (Soviet player of the year for Makarov and Czechoslovak golden stick for Stastny)
Makarov: 1, 4*, 9
Stastny: 1, 6, 12, 12, 15
* Since the SPOTY poll was not conducted in 78/79 due to Mikhailov winning the Izvestia golden stick voting I used Makarovs result in that voting instead since the entire top 6 were Soviets.
Izvestia golden stick voting (Best player in Europe)
Makarov: 1, 4
Stastny: 8
Other main achievements
Makarov: 1x Soviet league scoring champion 2x First team Soviet All-Star, 1x Directorate Best Forward Award at WHC, 1x First Team All-Star at WHC, 1x Leading goal-scorer at WHC
Stastny: Would most likely have been selected to the Czechoslovak All-Star team had it been selected in 79/80.
So even if Stastny had the age advantage Makarov managed to achieve far more in the European game before Stastnys move in 80/81. Then from 89/90 this is how Makarov and Stastny compares when playing in the same league. This time it is Makarov who has the age advantage but on the other hand he also has to adjust to a new culture at an advanced age for doing that.
89/90-94/95
Makarov (age 31-36) 420 gp, 134 g, 250 a, 384 pts, 0.914 PPG
Stastny (age 33-38) 302 gp, 94 g, 159 a, 253 pts, 0.838 PPG
Their PPG:s are relatively close but Makarov sustained it over a far larger sample of games. So since Makarov was the stronger player both before and after the 80/81-88/89 time frame why is it so difficult to believe that he would have been superior during that time frame as well?