Is there a typo in the last graphic in your post, which shows an arrow going from Tx 2 in the mempool to Tx 3 in the block? And same for arrow going from Tx 3 in mempool to Tx 2 in block.

Also, although you say you will discuss fee rates in the next article, I think it has to be discussed here, at least so long as you are making claims like "To maximize their revenue, miners prioritize transactions that pay higher fees", which is not true, miners prioritize fee rates, not total fees. This is further confused in the last graphic where it shows a 7000 sats fee tx getting prioritized over 5000 sats and 4000 sats transactions. Strictly speaking the miner would be looking at the fee rate and prioritizing accordingly (knapsack problem aside...)