+1 VL Ike and Barst vs Warding Breath fodder

I have a -atk+spd VL ike with reposition, and I'm debating between foddering him off for warding breath on Corrin(f), saving it for the Hardin I will eventually get, or the next good iv tiki or nowi I get. Note: Barst is being used as reposition fodder. If I merga my Ikes, I can save a reposition for another unit, while if I sack my old VL Ike, a need to feed a barst to the new one.