A scapegoat. Shirou understood that in order to conceal his identity as a Master, he needed a substitute Master or scapegoat to serve as a decoy so he can disguise himself as Caster. This will solve one of his problems, but...
Despite this realization, deep down he still desired to have another scapegoat take his place as a Servant, yet he knew there was no way to make it happen.
The distinctive aura of Servants is easily recognizable, it's the same with his unique aura brought by his Saint Graph. But this is only when he was activating it. This is why Matou Zouken initially failed to see through him as a Servant, underestimating him and ultimately resulting in defeat.
However, when considering someone to act as a substitute, Shiro couldn't bring himself to use an innocent person as a sacrifice. After much contemplation, he could only choose someone who is extremely nefarious. Thus, the only viable option was Uryuu Ryuunosuke who still roams free as a murderer.
Trying to enter the deadly whirlwind of the Holy Grail War and then attempting to escape from it? Impossible! Ryuunosuke is simply elusive and difficult to capture.
The only thing for certain is that this individual is still in Fuyuki City. However, it is of little concern as he is no match for Shirou. Even someone like Ryuunosuke, who managed to evade justice in the technologically limited 1990s, would not be able to evade capture in today's world of nationwide surveillance cameras, instant internet access, and DNA tracking technology.
It is sufficient to demonstrate to him the true meaning of justice in a harmonious society. And with his mastery of magecraft, Shirou now possesses the ability to match the technological advancements of 2019.
There is a basic form of magecraft known as "Search," which uses a strand of hair from the targeted individual to locate their whereabouts. Even though Shirou may not be aware of this particular magecraft, it is ingrained in the spiritual foundation of Emiya. The range of the search is determined by the amount of magical energy used in the magecraft.
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