David

Tennant was considering doing one more year which would have been Moffat's 1 year as Showrunner I think so some of Matt's 1st Adventures were written for DT

Also TENNANT he grew up a HUGE FAN OF SHOW JUST LIKE CAPALDI

I Like the making the Guitar 🎸 Part of the 12th Doctor Since Capaldi Does play the Guitar 🎸