Cannot imagine Rocky's thoughts about Stratt if he was told the full story. There's a lot of opinions about this going around, and I get the "Rocky would just hate her" theory, but it's so much more complicated. Like Grace's own opinion.
There's this woman who was doing everything imaginable to save her species, her planet. Your friend worked for her, trusted her, cared about her. You love your friend, and he's the first sentient being you have met in decades, half a century. He's the reason your world is saved and you can go back home. He's the reason you're alive and gave you hope. His mission was supposed to end in death, by design, but you saved him. He uses that gift to save you instead. Save your planet. There's a woman who did awful things for the sake of the world knowing she would pay the price. She (thought she) killed your friend. But he's not dead! But she couldn't know. The woman sent you a saviour, a gift from the sky beyond your perception. She betrayed your friend. She's the reason you can go home. She hurt him and made him scared scared scared. She saved her world, gave you your best friend. She took his memories (eridiana don't forget. Can't. Amnesia must be a horror story) and autonomy. She is the reason no other crew will die, because now you know the dangers of space.
I don't think Rocky hates Stratt, but I'm not sure he would like her either. Respect for doing what had to be done, anger for following through with it.