I agreed that Altare should not choose the Valk for the competition, he should choose something more defensive like Lifeline. I watched both TSB and Laplus team playing. Laplus is being chilled on the ring, and constantly used ult to obtain better defensive loots on the go (because she is bad at playing, so their team also play defensively).
However, I don't agree about the point on sit in the building. I saw a when the ring closed after 10~15 mins, there is still 17~18 groups in a small ring. Everyone played very defensively. Most of the team only went offensive when the ring of closure area fucked them over, or they had very bad loot.
Axel played very risky and always try to gamble on landing site with Valk, and always get fucked in the end. So yeah, changing the Valk into other characters should increase their chances