Not really. Lockwood was the star of Roddenberry's first series as producer, The Lieutenant, which ran for 29 episodes in 1963-4. He played US Marine Lt. William Tiberius Rice. Why does that name sound so familiar...?
In 1961-2, Lockwood was a regular in a series called Follow the Sun which ran for 30 episodes. And in 1962, he played the heroic prince in Bert I. Gordon's The Magic Sword, opposite Basil Rathbone as the evil sorceror. He defeated the sorceror, saved the princess, and lived happily ever after.
Lockwood was the bad guy in a season 7 Mission: Impossible episode, and unlike many M:I villains, his character survived being shot by his co-conspirator and was arrested at the end. He had two Six Million Dollar Man appearances that split the difference; his sniper character in the first episode was taken alive at the end, but the sequel revealed that he'd died in prison and his identical twin brother was seeking revenge. The brother was also taken alive, this being the '70s when there were more restrictions on network-TV violence. Lockwood returned as a traitorous OSI director in The Return of the Six Million Dollar Man and the Bionic Woman in 1987, and was taken alive at the end.
So no, there was no "habit" or "rut" here -- just a coincidental similarity between Lockwood's two most famous roles. Two examples aren't enough to define a pattern.