While that study (and studies like it) provides an interesting set of data points, they don't provide real insight. I'll leave the limitations as an exercise for the reader with some answers provided in the link below.
Here's Lyle's take on daily requirements:
Here's a quote from Lyle that paraphrases Tipton and Wolfe:
We donít know how much protein is required to optimize all of the potential pathways important to athletes
That basically sums up our collective scientific knowledge of strengthening, conditioning, and nutrition. We have a ludicrous number of reductionist studies that loose most meaning when placed back into the context of reality. Arguing from individual scientific publications (in S&C, nutrition, and some other fields as well) to actions in the real world for real people is frequently fraught with peril.