Yes traded for two tackles, not guards. I look at tackles and guards separately.
Mafi and Andrews replaced Russey, Hines, and Ferentz. Those two must be impressing. Are they great players? We will see if the Pats sign Onwenu and how late they draft IOL next year and we will know.
Sow is still a question mark. Assuming T Brown and Reiff only have a few years left, we need 3 tackles, LT, RT, and a backup. We have Sow, Anderson, Wheatley, and Lowe. Hopefully we get three out of four, but may only get one or two. We will know how the Pats feel based on this year's RT playing time, cuts (they have to cut 1 or 2 OL in the next few weeks), and next year's draft. My guess is we will draft a LT in R1 or R2 next year and keep 2 of the existing 4 younger tackles long-term.
I think Mafi, Sow, and Andrews become starters with Andrews the biggest risk. I am hopeful for Wheatley as well. Lowe and Anderson look like backups to me.