It was a guy called "Lone Nite", he stopped playing way before the construction, summon and hunter skills came out mainly because he passed away due to cancer.
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P.S I may have the name wrong.
I think his name was "the old nite"?
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If you go on runescape highscores, you can see that lots of people have 99 skill level in everything. Every single one of these players will have all the skill capes
Walking is not a skill at all. However, your Agility level effects how long you can run, walking however is not and most likely will never be incorporated as a skill in RuneScape.
Heaps. iT takes 4000 hours of work to get to level 99 in all skills (according to runescape)
Dungeoneering is a skill in which you travel through various levels in Daemonheim. It uses all skills. You can train it with your friends with this skill. Many players call this a "minigame" as it is unlike any other skills.
Zezima