Sutekh clinging to the TARDIS all this time is SO funny considering what the TARDIS has been through since then
Jack Harkness and Sutekh clinging to the TARDIS at the same time
When the TARDIS got all bighuge on Trenzalore?
When the TARDIS was exploding for an entire season?
When the Doctor was in the confession dial for billions of years, and also when Eleven stayed on that one planet for thousands of years. Sutekh just waiting in the same spot with nothing to do lmao
All the times the TARDIS got shot at, or dropped in lava, or crashed into things, etc
And the many times the Doctor's enemies scanned the TARDIS with much more advanced sensors than UNIT has!
Were they all just like "well thats none of my business" or what
Or as my friend @cakesandfail suggested: Maybe they all saw Sutekh and he was just there shaking his head and going "shh it's a surprise!"