Equally respectfully, you must have played a different game. In mine, Alistair always displayed a distinct lack of anything resembling leadership skills - including the Korcari Wilds mission and the Ishal thing.
Most of his comments are noise, simply restating what is obvious to everyone:
"My Grey Warden sense is tingling. We're in danger again."
"More darkspawn. Close by. You know the drill."
"Let's cross the bridge and get to the Tower of Ishal!"
"Here we are: the Tower of Ishal. Let's get up to the top quickly so we can be ready for the signal."
Never mind that a leader would keep his enthusiastic but inexperienced padawans from committing silly mistakes like dying in a frontal assault on a fortified enemy position.
When some leadership might be indicated, Alistair restricts himself to silly jokes and plain emoting:
"Yes, swooping is bad."
"Here no longer?" You stole them, didn't you? You're... some kind of... sneaky... witch-thief!"
"I'd be careful. First it's, "I like you..." but then "Zap!" Frog time."
"Maker's breath! What are these darkspawn doing ahead of the rest of the horde? There wasn't supposed to be any resistance here!"
And in the end he panics:
"The beacon is over here! We've surely missed the signal... let's light it quickly before it's too late!"
Never mind that he should have told someone else what the signal was supposed to be, in case he was wounded. Never mind that he doesn't stop to think whether it was even possible to have missed the signal, given the timing (Duncan having said "less than an hour" and the team reaching the beacon after three quarters of an hour typically).
In other words, the designers didn't even try to give Alistair more than redundant ambient comments. On the other hands, it jibes with Alistair never having been in combat with darkspawn except once.
P.S.: "I've only fought them once up close. And that was before the battles here started... which Duncan has kept me out of so far."