Who are the saints / holy ones in 1 Thessalonians 3:13 and 2 Thessalonians 1:3–12?

In June 2017 and May 2018, I had email exchanges with Prof. Larry W. Hurtado and Dean Craig C. Hill (two high-caliber NT scholars) about the second coming, the rapture and, more specifically, the saints in 1 and 2 Thess. 1 Thessalonians 3…