It's not "wild speculation" when we just look at what's right in front of our eyes.
Then there's blind denial of what we see right in front of our eyes.
Either way. If it came out that steroid use was rampant in the NBA, would anyone really be surprised?
What's right in front of your eyes are world-class athletes who are paid more than most people's entire families make in a lifetime for playing 82 games of basketball, and they spend a good deal of money on nutritionists, personal trainers, personal chefs, and gym memberships (

) to take care of their bodies.
People keep throwing around the argument that a player can't put on 15-20 pounds of muscle in a four month period like it's fact. People were saying that when it was reported last fall that Kevin had put on some muscle. It's not fact. And it's not fact that the only way you can put on that kind of muscle is by using illegal supplements. It's fiction, and it's irresponsible to jump to those kind of conclusions.
I could leave it at that, the way that the "they must be using because they look too good" crowd does, but I'll present facts to support my case:
There are 454 grams in a pound. A 220 pound athlete with a body fat percentage of about 10% (which is probably high) would have to consume about 60-70 grams of protein daily to maintain that weight, and would get about that much from a normal diet. If that athlete added two protein shakes a day (about 60 grams of protein), spent about one hour a day lifting weights and about 40 minutes burning fat, he would be able to add just about a pound of muscle every week, which would be about 16 pounds over the course of four months, depending on his metabolism. On top of that, he would be reducing his body fat percentage, and would in turn look more muscular.
The fact that professional basketball players spend a lot more than a couple hours a day training, in addition to the fact that they take supplements vitamin complexes to improve their workouts, and it's not hard to see how a top level athlete can put on 15-20 pounds of muscle in the offseason.
Their bodies also respond differently to weight training in the offseason, because they're not playing games. When you play basketball and other sports that get your heart rate up and sustained for a long period of time (anaerobic activity), your body actually metabolizes a good deal of muscle. So when they are able to better monitor and control their heart rate during the offseason, they manage their weight better, and it's easier to build muscle.
I'm not arguing that no one is taking illegal PEDs in the NBA, because I'm sure that some of them are. I am, however, proving that it's not necessary to put on muscle. Any reasonably fit man can put on 15 pounds of muscle in a four month period, assuming he trains right. It's irresponsible to claim that anyone who comes back in the fall looking bigger and stronger must be juicing, and it's not fair to the people who get in the weight room and work hard to get in better shape, and do it clean.