In a word yes. As long as you log on you should still be able to see everything, I think they aren't too keen on guests viewing info without an account.
Tracking the weights over the fighters careers is important because you can see some of reasons why they were great or not in various fights & situations
4 example it explains 1 of de biggest frauds in de history of de sport which is Ray Leonard's career.
" Its delightful, its delicious, its delectable, its delirious,its dilemma, its de- limit ,its de-lovely! " Cole Porter.