when I got to the battle tower the first thing I told Allan to do was make his potion, finished the game and he never delivered, has any one seen this potion

If you did your digging and reading, you would know what his potion is a lie. Or rather an experiment that never worked. (From reading his mind + finding a book about an alchemy contest that Barobos or whatever his name won and Allan failed.)

I don't believe Larian made us do the certain choices there. From all the angles f.e. Enchantment, one guy was weak other guy was strong. SO the choice was actually already made. I wonder tho, the actually weak guys, Allan, that chanter, the D. Slayer and Igor can do better than others?

Choice already made. You wish. It's you who made a choice and you who killed them. No one else.
And there is no "weak" or "strong" masters (dunno in what meaning you said that), someone good @ one thing, someone @ another.

Allan was the only one with real reason (information prior to choice) to not get him. What I did is pick up all people from the shipwreck for RP reasons. (They know each other already so better synergy in the tower.)

As for the necromancer, I picked the master for RP reasons too. I want to eat my food in peace without worrying about being poisoned. Also I liked the master, look at my signature.

you mean you never got the potion or you never figured out what it did -- cause I got one the first time I talked to him in BT simply because I had the ingredients on me already...they weren't even that rare

as to what it does though...couldn't tell you

I alreaady hsd the ingredients, and I read the Alchemy Monthly, and alan,s mind, but I let the island pick and "she" gave me Alan, Igor, Wesson,and Hermosa, on the second try I picked Barnabus, Radcliff, Hermosa and the other Necro, all that changed was the quests for the different platforms, and the 3rd time I gave Allan another try and he could not make the potion

The potion is not a lie. It is like a greater potion of dexterity, strength & intelligence combined into one.