Sitting up before rolling?

Did anyone elses little one learn to sit independently before they mastered rolling over? My son is now sitting for up to 5 minutes independently at 4 months old! He rolls from tummy to back but only on my bed so i dont consider him to be rolling fully yet as he struggles on firmer surfaces. He rolls from back in to side lying but not from back to belly yet either. Picture of my little man for cute tax. (No i dont let him sit up unless im around and able to catch him if he falls)