Assuming that you wished to perfom all of those activations, it is correct. The only small mistake is that the Warrior would add 5 power because the Paladin's ability is half rounded up. Otherwise, you played this out correctly, and the total would be 4+5+6=15.
Okay thanks. But I'm pretty sure The warrior would give 4 power. He's 7 base, rounded up is 8, half of eight is 4. Or half of 7 is 3.5, rounded up is 4.