Only 22 hours and 41 minutes remained before Su Xiao returned to Reincarnation Paradise, but he showed no sign of panic. The reason was simple: his Main Quest was to survive until the end of the Holy Grail War.
Surviving until the end of the Holy Grail War could actually be understood in two ways. The first was simply staying alive. That would not yield a particularly high overall evaluation, but considering the number of Servants Su Xiao had killed, his evaluation would not be too low either.
The second was to artificially speed up the end of the Holy Grail War and summon the Holy Grail within the eleven-day time limit.
If Su Xiao had not been fighting Blood Gate in this world, he could have accomplished that. But he had first fought Blood Gate to the death before going after the other Servants. Most of the eleven days had been spent battling Blood Gate, and the time remaining was clearly insufficient.
Having Rin use their familial bond to find Matou Sakura was something he had no choice but to do. If Su Xiao's guess was correct, there was definitely an old schemer advising Matou Sakura from the shadows. Otherwise, she would not have remained hidden from beginning to end. Even now, Su Xiao did not know who Matou Sakura's Servant was.
If Matou Sakura had truly been saved by Blood Gate when she was young, then considering Blood Gate's purpose in creating an artificial Holy Grail, Matou Sakura would at least retain a pure and kind heart. Only then would she make the best Holy Grail vessel.
Would sweet, candy-like Matou Sakura know to remain low-key throughout the Holy Grail War? Absolutely impossible. If Su Xiao's deductions were correct, she not only had an old schemer who meant