John's fantasy football start 'em, sit 'em picks for Week 15 of 2025. Are the breakout performances from Shedeur Sanders, Ryan Flournoy, Mike Gesicki legit or flukes?

Players can have breakout games at any point in any NFL season. While it might seem like we already know all the players who will be fantasy relevant for the fantasy football playoffs, we've seen players have elite stretches over the past three or even two contests, sometimes seemingly out of nowhere.

There are a huge number of factors that can influence breakouts. For example, Arizona Cardinals wide receiver Michael Wilson hardly moved the needle at all until he got the start due to an injury to Cardinals WR Marvin Harrison Jr. (heel) and backup quarterback Jacoby Brissett getting the start.

Sometimes, it's increase

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