Just want to confirm this with some details.
Everyone essentially started Season 4 in catch-up mode. Players were able to get 1 Splintered Spark of Awakening from the weekly quest, whether that’s the weekly “Last Hurrah” quest or the PvP weeklies offered by Malicia.
And then you’re able to get another splinter / half-spark from any valid catch-up sources, such as Mythic+, Awakened Raids, and PvP wins.
Next week and thereafter, only one Splintered Spark is obtainable every week. And like Seasons 2 and 3, with the increasing cap on Splintered Sparks per week, and if you ever fall behind you will be able to get Splintered Sparks from any catch-up source.