Why would one coin not be able to achieve a particular market cap?
Market capitalization is a better comparison than price alone because some altcoins can issue more tokens than others. For example, dogecoins/bytecoin versus Byteball. Byteball is worth $600 a pop right now whilst dogecoins/bytecoins are a few cents each. Now you can't just say that byteball has achieved higher height sthan dogecoins or bytecoins simply because it's worth more. Thta doesn't work
What you say won't work either
For the reasons said and repeated numerous times already. You don't know how many dogecoins, bytecoins, byteballs, or whatever are actually circulating (traded). In this way, a coin which may have higher price with greater supply simply because more coins can be stashed and thus the effective number of coins in circulation is less in comparison with some other coin which might have have lower price with lower supply but higher circulation numbers. Or just because one coin can be a real deal while the other real trash