Hello! Once you buy any rank either it would be Muncher Chomper etc you would no longer need to buy the next rank by itself instead you'd be able to buy the rank upgrades for the prizes shown so yes that is the case and goes for all ranks for the prizes you see :)
Hello NotProdigy, if you could create a ticket on our discord explaining your case we will surely be able to get someone to help you! Our discord link is here --> https://discord.com/invite/opblocks