To an extent it's important to keep things in context. Is a person merely providing good information or are they pretentind to be some huge built guy. Good information is good regardless of the source. Take a look at golf, the big money winners have guru teaching pros that generally have very limited competitive success. The best coach is not necessarily the best athlete or even a reasonably good one, where he excels is in taking athletes and getting them to perform at their absolute best.
In BBing where there is no performance criteria drugs can compensate in a huge way simply because it's all hypertrophy based. A natural lifter can know 10x more than a guy running around on 3 grams yet to many people they would think the results speak for themselves yet they really don't. I'm a lot more impressed by the people who gain 10lbs off a modest dose of primo or another refined anabolic than I am with the kid that gets 25lbs from a gram of test a week and 150mg of anadrol daily. Shit, look at farmers and their cattle. I have yet to see them on any weight training program but between food and enough drugs they bulk up nicely. Drugs can simply compensate too much when it comes to hypertrophy.
Years ago, I worked right next to a guy who went on to earn his pro card 6 months later. The guy looked fabulous and admittedly had very good discipline with diet and kept himself in good condition. However, this guy knew shit about training. He was unfit to coach a high school team. He never squated, never pulled from the floor (the 2 most fundemental movements for adding mass to the frame), and hardly ever benched. His PT clients made zero progress where mine were doing great. He trained this one Dr. who had been training under him for years and knew a client of mine who had just started training 2-3 months ago and put on some solid muscle. The Dr. had always been bigger than my guy yet one night they were out and my trainee went to put on the Dr.'s jacket and it was too tight. The Dr. got so fed up he went out, got himself some juice and put on 20lbs using the same program and training methodology that had him stagnant before that. Now, most people would look at me at the time and look at this soon to be Pro BBer and think that guy knew it all. However, if you judged our PT client's progress it was night and day. If a knowledgable lifter watched each of us train for even 10 minutes, the truth would be self-evident to him.
What does all this mean - if a given person is providing information and the information is quality and helpful they may not be the biggest and most ripped guy around. Hell, I've had almost 2 years worth of injuries. I couldn't bench over 135 without searing pain for over 10 months. I'm 6'3" 250ish but I'm not in shape and my lifts are shit. I'm also at a point in my life where family and work are my priorities and I lift for personal enjoyment and enjoy seeing others succeed. The information I provide has little bearing on my current physical condition.
However, if a given person is just putting himself out there as a big muscular in shape guy - that's easily proven with pictures.