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Fill-ins shouldn’t be confused with Fills. Fills occur during a break in the Time-Keeping, and often when nobody else in the band is playing.
On the other hand, Fill-ins occur during the Time-Keeping by adding extra notes between the regular Time-Keeping notes and Groove. This is often done on the Snare Drum quietly (with ghost-notes) or on the Time-Keeping cymbal or on a different one like the Hi-Hat if the Time-Keeping is on the Ride cymbal.
Fill-ins shouldn’t be so loud that they change the Groove because 60-70% of what drummers should be doing is “Support” of the Groove. Instead, Fill-ins are added to thicken up the texture of the groove and so are a form of “Embellishment,” which is about 20-30% of what drummers should be doing. Where you do this creates internal phrases that help the Groove flow like waves of energy in the music. I call these patterns “Rhythmic-Energy Contours” (see Drums – Grooves) just like there are melodic contours regarding the flow of pitch in music.