Wow Quow! The bronze medallist (“only” 45.02sec) ran almost perfectly even splits for the outgoing 200m and the return trip:
1st 200m in 22.43sec; return 200m in 22.59, differential 0.16sec.
Thankyou Speedman. You got my vote for extra rep points! 
If we can find the rest of the 400m races - including women’s final, any semis etc - that the biomech team studied it would be a great resource to have those posted here as well.