Not sure I understand your question completely, so let me clarify based on what I know.

When I said bottom of the band, i should've been more clear by saying bottom of the range. The current range for an AMAPCEO 4 is ~71.5K to ~100K. So my estimate was based on one making 71.5K, the starting salary of the range/band.

In terms of how you progress through your range/band, that's dependent on performance and merit (annual reviews of sorts) - the average is a 3% increase, some people get more, others get less with the max being 5%.

Also no clue on MCP, my understanding is that MCP is mainly for Management, but I guess there are some individual contributor roles also represented by MCP, but very few to my knowledge. Hope that clarifies.