There is an element of luck from week to week, but it will balance itself out over 20 weeks. You want variance from week to week, where you have more luck than others, but its certainly not luck over the entire season. Some weeks will go well, others will not have the same breaks, but that will typically balance itself out over time. Injuries and the dreaded GTD/Out category before a player officially gets put on the IL can also mess with things.
As for my being "lucky" this week. I was actually going to post on Thursday evening that I was getting hammered with bad luck regarding short-term injuries this week. But you gave it back on Friday so that factor is pretty balanced now (see my post below). As an aside, going to the Waiver Wire to pick up a C is tough as I had to do on Friday night to pick up Dorian Finney Smith temporarily -- some real scraps there!
Brogdon and Hardaway are up and down players. I certainly got their peak. They have good games, stinkers or in the case of Brogdon get injured. You pick them up off waivers knowing that, and don't bank on them as long term members of your squad and hope you get their good games. I also saw Brogdon was playing on a team with injuries and was playing San Antonio back to back, so it played into my claim last week.
Wagner is a 21/6/4 player this year who is on a mild heater right now. I think its a bit odd to label his recent streak of games as great luck.