Does adding Whey Protein to your diet actually help in muscle growth over just a traditional diet?

I’ve done enough reading about this online, and have seen enough before and after photos to realize, something must be working.

I have read enough to know Whey Protein, or Whey Protein Isolates are the fastest method of getting protein. Which leads me to believe it must be better than just a traditional diet by itself.

Traditional proteins from chicken and other food can take several hours to absorb completely into your muscles, whereas Whey Protein has much higher absorption rate. This is factual, and I’ve been able to find studies on this.

I’m hoping someone else can help me find a study proving through use of a placebo group vs a whey protein group, where there were not only noticeably better results (which I’ve found), but have numbers and figures (muscle mass index, weight gained, measurements, etc), which I have yet to find. The only studies I’ve found have just mentioned that the Whey group vs Placebo group (a Casein protein) showed that the Whey group showed greater gains, and were able to have more intense workouts, but didn’t give any measurable figures to show it.

I can’t seem to find anything to prove it? Can anyone lend some help and or personal experience?