I can confirm that at some point before the breeding alpha egg inclusions, alpha Dazzi (from dungeons is how I tested it) appears the same size as regular Dazzi. I’m very happy they changed it, but some pals like alpha hangyu still stay small when used as a glider
It's the Dazzi/Daedream necklace that you can unlock in your tech tree. Once you crafted it, if Dazzi/Daedream is in your team, it will stay by your side and attack enemies in tandem.
Alpha Dazzi always was, for me at least. I don't think I've used Daedream in so long for me to say accurately.