2 years stop gap. Yes Marvin...
I have agreed with you severally on this issue. I believe like you do that he is highly likely a declining force.
I agreed with you when you said he uses speed and power in his game. I corrected (or adjusted) your claim and suggested what you meant was "explosiveness."
I agreed that explosiveness tends to decline as rapidly as speed as you age.
The fact he has also played 4 straight years of nonstop all year round football on his body the last 4 years also supports this.
All the above I agree with. I simply disagreed with your conclusion that CB is the solution instead.
A 2 year stop gap can be an effective transition from a good offense to a great one the next 2 seasons just as the great young players (Sane, Sterling, Silva and Gabriel) are hitting their WC potential stride when Sanchez and Aguero are fading.