Justin =/= scattered *NSYNC members
JC, Joey, Lance, and Chris have nothing else going on so of course they would want to jump in on a relevant story even if it’s about their own irrelevance.
Justin doesn't have to say anything. He’s way past the boy band and is a bigger deal now.
And Justin and Adele love each other. He approached her at the 2009 Grammys to meet her. She said she screamed when he came to her. She attended his shows during the 20/20 era several times.