Heavily Invested

Hmm... or was the ‘different’ dawnshard used in the Oathpact? And potentially broken or changed? I mean, it could have been used to ‘Unite’ the heralds and also give them immortality... binding both voidish and mortal (I think that’s the quote?). New to the site, but lurked a long time... Which would then explain how Dalinar could be bonding a dawnshard, as the oathpact isn’t quite dead but it is damaged. Kind of like how Adolin is sort of bonding Maya.