It's way more than a meme!

"Let's go Brandon" was #1 on itunes for days. Another version was #3. Another version was #17. All at the same time! Huge swaths of people from from highly diverse backgrounds are unifing against what they see as poor leadership.

They are totally trying to sow FUD into the narrative form political purpose.

iTunes chart positions don't mean nearly as much as they used to, since music consumption has mostly shifted to streaming. It's common for meme songs or songs by artists with devoted fanbases to get to #1 on the iTunes chart, but make a weak showing on the more comprehensive Billboard and Rolling Stone charts, or not even enter those charts.

It's pretty obvious that they went out and found someone named Brandon to have a photo op with. This was an SEO play.

What are the chances of finding someone with the name Brandon though??

If you're looking for one? 100%.

Depending on your definition of unique. Roughly one out of 700 people are named Brandon according to wolfram alpha

Are you joking?

You're stating you think it's obvious. But I would argue it's highly unlikely, and frankly a bit silly.