No professional would have taken up the job. It was a wide open country with no escape route. Even if escape could be made, going anonymously would have been impossible given how many cameras are there with every single person these days. Also, professionals would know that they would be put down to keep the secret even if they make the exit without revealing their identity.
7.62s are rare guns in USA. So, finding an amateur with enough experience on the higher recoil dumb enough to go in a suicidal act, is difficult. Finding the amateur with a specialist rifle with higher calibre would have made the assistance behind him obvious.
The MAGA crowds aren't only those who come to the rally. There are plenty of them in all of the forces where the country boys outnumber the leftist elites by leaps and bounds. So, nobody even in CIA would dare leave obvious signs behind that Trump was removed on behest of the deep state.
However, we are forgetting that there is another power, which is increasingly getting brazen and has enough ambition which can be thwarted by Trump's second innings - China. Would China mind bankrolling any ops - may be a few mil - to get rid of the rsik to their billions of dollars' worth investments?
This is nothing read about Viktor Ilyin, He was less than two years old when he was taken away from his alcoholic parents and grew up in a foster family.
He entered a topographical technical school and desired to become a geologist. However, after travelling to many different regions, a "depressing impression" was left on him of "poverty, drunkenness, devastation" - different to what Soviet television showed. As a result, he drafted a reform plan which included a monthly payment to each citizen from natural resource sales, which he sent to the Kremlin, but did not receive a response. He said that was when he decided to kill Brezhnev so that everyone would know of his ideas, where he planned to speak about his plan in court. He spent almost a year preparing to assassinate him and joined the army after graduation to gain access to weapons.
When Ilyin was on duty, he stole two Makarov guns and four magazines from his army unit's safe and went to Moscow. He went to the Kremlin, and looked for a good firing position, choosing a place very close to the entrance gate. When the motorcade entered the gates of Borovitskaya Tower, carrying cosmonauts and top Soviet leaders, Ilyin fired his pistols at the second vehicle that he erroneously thought was carrying Leonid Brezhnev. The vehicle was occupied by the cosmonauts Georgy Beregovoy, Alexei Leonov, Andrian Nikolaev, and Valentina Tereshkova. A bullet killed the limousine driver Ilya Zharkov who was driving as a substitute on his last day before retirement. Beregovoy was wounded, and Vasiliy Zatsipilin, who was part of the motorcycle escort, was also hit, but was able to aim his motorcycle at Ilyin, bringing him down. The guards arrested Ilyin.
The head of the KGB, personally questioned Ilyin. During his interrogation, the recording of which was found in the Russian State Archives after 1991, Ilyin told Andropov that his motivation to assassinate Brezhnev was to have him replaced with his Second Secretary and Party Ideologue Mikhail Suslov, whom Ilyin called "the most outstanding person in the party at the moment". Whether this was true or if he was simply trying to provoke infighting within the Politburo remains unknown. He was facing the death penalty, but after an investigation, he was considered insane and was placed in Psikhushka for 20 years. In 1990, he was released.