So to see what was Sergio's Value to the team over the season, here are some highlights vs Hamilton:

Monaco: Overcuts Hamilton to 6th Place, Max wins

Baku: Doesnt alllow Hamilton to pass him all Race, and at the second start up, HAM goes long and ends 16th

France: Due to position makes Hamilton not go into pits, Max catches up, passes HAM and wins race

Silverstone: Took Fastest lap from HAM

Turkey: Perez defends and leaves HAM in 5th, Max gets 2nd

Austin: Makes HAM make a Pit Spot too soon to prevent undercut, Max wins

Brasil: Takes fastest lap from HAM

Abu Dhabi: Holds him up for 10 seconds making HAM skip Pit stops in order to not lose position.

Might seem like small things but some of these where enough to shift the balance of who ended up as champion. You can say the same about Bottas, but HAM had him for years while Max didnt have that support before. He got the support and it turned into a Title win.