A simple thought experiment: name a character from a T-M and assign to them the team of six Servants they would field in Fate/Grand Order.
Tohno Shiki:
Carmilla
St. Martha
Scathach
Ushiwakamaru
Bonney and Read
Nursery Rhyme on regular support.
Illyasviel von Einzbern:
Herakles
Kiyohime
Brynhildr
Paracelsus
Mysterious Heroine X
and an EMIYA support.
Gilgamesh:
Gilgamesh
Gilgamesh
Gilgamesh
Gilgamesh
Gilgamesh
Mordred
...Voted Most Likely to Not Roll any FSN Saber permutation.