He literally lives his life as if Drake and Josh never ended.
"But I knew him"
The WORST GIF in this series is the black and white one where Steve is grinning, because you NEVER see that again. EVER. I can literally count on my thumbs the number of times he smiles in Avengers, and… maybe on one hand the number of times he smiles in Winter Soldier. But that full-teeth, squinty-eyed grin we see in that GIF? NEVER AGAIN.
On 16 April 2005 - 9 years ago today - the BBC announced that David Tennant was to be the Tenth Doctor.