Watching nuwho from 15th then 9th

So I started watching doctor who from the 15th doctor and now i am watching the whole nuwho starting from 9th and it's so werid watching it knowing that Sutekh is like still on the TARDIS with them all the time (ik that when the 9th doctor was being recorded it probably wasnt even planned yet but lorewise its still kinda weird to watch although im loving 9th doctor honestly)