Theory/steps:

1. BTC whales gather BTC via mining

2. Whales purchase gigantic bags of ETH with BTC

3. Whales then sell said bag of ETH for USDT, pushing ETH price "back where it belongs"

4. Whales then use USDT to buy BTC and push the price up (while simultaneously removing their own sell walls to amp it higher)

5. Net effect intent => keep price of ETH low while BTC rises

Why? Because they can. They're whales. With an agenda: Maximalism 

The current "supply problem" is actually a problem BTC has because the halvening limited the efficiency of the price control strat that had been keeping ETH "in line" for a while. Whales' bags are shrinking methinks, the water must be mighty cold right now. How much longer before ETH price decouples? I'm not sure... But when it does, the Maxi's will get beached. And BTC will still go to $100,000. 

If indeed this has been a strategy over the last couple of years (I've witnessed the pattern numerous times, usually coordinated with some Twitter FUD/ETH hate to mask the intent), I'm not sure how much longer it will continue to work. Real money IS actually flowing to ETH and that flow is increasingly preferencing ETH over BTC. I only say that based on my own experience. It's much easier, faster and more efficient to get into this space via ETH, for the average person.

My favourite analogy of the two chains is this: BTC was like the chain that put the inital dirt road down in the wilderness, ETH turned it into a Highway and added shops along the route. Would you rather drive on a rutted, muddy dirt road or on a paved highway with a few construction sites and shops to meet, greet and eat on your travels?

I prefer the highway, unless I'm in the business of meeting people who don't want to be seen back an old dirt road somewhere, to switch off briefcases or something.