The way and manner of speed ETH bullish at times makes me feels one day, the pump price ratio of ETH may outgrow BTC not in terms of how much is BTC or ETH? But the ratio speed of pumps per bull. I remember 2018 when ETH was less than $150 but ETH takes two weeks to bull market. If somebody should be wise enough ETH would be the next 28k dos.
In my opinion, what determines the probability of an altcoin price growing is the market cap. The lower the market cap, the higher the probability of growing, and depending on this fact we can measure how much every coin can rise. Clearly, I'm talking about legit projects that have a product and not just a pump and dump coin. Regarding ETH, it has a higher growing probability than Bitcoin simply because it's less than half the market cap of Bitcoin, so the probability of doing more × is high. Indeed, ETH price made bigger × than Bitcoin in the previous bull run, and I expect it to do the same in the next one, as the Ethereum team are doing their best and the improvement of the network is going well. However, not every altcoins will do the same, as we also saw altcoins that did much less than Bitcoin. Actually, most of them didn't even surpass their previous all time high.