I watched Sr vs Leonard coincidentally like 2 days ago. What I took away from that.

1)Srs right arms really was hurt as he claims. There were portions of the fight he left it dangling straight down, useless. Not playing possum or trying to get out of the fight but clearly injured. There were times he had Leonard tied up with his left with his right arm free to punch or defend but still it dangled straight down. You don't do that unless there is a genuine injury.

2)Sr took a couple rounds off Leonard

3)Leonard was a bit confounded by the style causing Cosell to ask repeatedly what was wrong with Leonard

4)Sr was a very clever fighter but didn't have 1/3 Jrs ability

5)all Leonard could get through was his left hook

You'd have to favor Leonard but anyone saying they are sure either way is talking out their ass.