If we want to maintain both statements, we can assume that Turgon was tallest because his taller brother was deceased at that time [ie. of the Tuor story].
"Arakano was the tallest of the brothers and the most impetuous, but his name was never changed to Sindarin form, for he perished in the first battle of Fingolfin's host with the Orks, the Battle of the Lammoth." (HoME XII, 2, xi [Shibboleth])
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