We've learned Androl has a "Talent" for Gateways, not that his Gateways are incredibly large. The only one we've seen him make was incredibly small - he made it to use it as a cutting tool. As far as we can tell, they are rather very precise, eg: he controls their size and very exact location far more precisely than others. He may also be adept at reaching very precise locations. He seems adept at weaving small flows with great precision.

It's debatable whether this qualifies as "a Talent". I think many have overlooked all the background information we were given about the guy. First, he's one of the best travelled character we ever heard of. His POVs are full of hints that the guy has lived all over the place over his life, even visited odd places like a small island the SF themselves don't go often to. There's been hints he's lived in Cairhien, Tear, Illian, Tarabon, Murandy, Retash... The second element we've heard is that this guy has been apprentice to dozens or more craftsmen over the years. He can work leather finely and for high precision operations - very minutious tasks - he can give advice about the digging of a canal like an engineer, he has been apprenticed to an architect and thus must have developped very good spatial skills.

If we combine the fact he is very weak and since the beginning of his training he's had to handle very small flows, that he's got skills in dozens of trades including some requiring fine motor skills and finesse, and others in which he developped his spatial coordination and skills, and if we add on top of this that the guy seems to know the Westlands and beyond like few others as he's been everywhere, it's not all that surprising he ends up being extremely good with impressively precise Travelling Gateways, to the point he can use them as a razor sharp cutting tool safely and all.... Perhaps we don't have to look any further to know how Logain learned to open gateways above ground (not to cut the deck of the SF ship - it might be an innovation Androl came up with and showed him (we know Logain was impressed enough with his skills with Gateways he forced Taim to make Androl a Dedicated over this).

If you ask me, more than anything the guy's evidence of how much your experiences and skills outside channelling can influence your aptitudes and affinities with the OP. Androl is also an exemple of when an apparent weakness - his lack of raw strength - can be turned into an asset: because small flows is all he ever can manage and thus uses all the time, he's developped impressive skills with precise weaves using very thin flows... It's not suprising this aptitude has shown for Gateways; Taim focusses training mostly on wild destruction and tasks using large amounts of OP to force the men faster, but Travelling is one of the non destructive weace all the Asha'man learn, and it's probably just one of many "fancier" weaves Androl would be able to handle with great precision, for now the limited focus of the BT has just made it go under the radar. With his background and type of mind, I wouldn't be surprised given an angreal to boost his strength Androl may also be great at minutious tasks such as ter'angreal making etc. It's probably also a very good clue that by shunning too much practical knowledge the Aes Sedai have really undermined their channelling potential - most of them shun using the OP for mundane tasks, it's no wonder their minds are pretty dry when it comes to think of new practical ways to use the OP. Alvarin is a White and thus more extreme than the average sister, but remember how amazed she was of a description of an elevator... A sister could no doubt think of a way to power one with the OP... but they all seem to have zero background knowledge in mechanics and engineering....

By all evidence, raw strength is a big factor in the maximum size of gateway, though the weave itself seems to be another (some women much weaker than Rand can outdo him on this). That's also why Sisters have already taken the habit of linking to open larger gateways, and why others like many Kinswomen need to link to make open a gateway large enough to use.