You really need to go back and watch the film.

Finn gets to the crashed TIE , approaches the cockpit shouting for Poe, moves the jacket so he can look inside the cockpit, but the moment he tries to look inside the ground begins to give way and the TIE sinks. He doesn’t get a chance to climb inside. This all happens within a few seconds. Finn shouts out for Poe as it is sinking. He believes he was trapped inside the ship and dies. So why the hell would he go off in search of someone he believes is dead?

You really need to go back and read my post. This time for comprehension. Perhaps get a refund on that speed reading course you took! Ha ha. Joke, joke.

But, no, seriously, nothing of what you wrote above in any way conflicts with the points I made about Poe, Finn, and the jacket. Go back and read closely.