AK - Idiotic sizing tell?

BTN is like 8/0 after some really insignificant amount of hands. We'll just assume that's he's like level 0 thinking weak tight passive type player, let's say along the lines of 16/5.

Poker Stars, $0.01/$0.02 No Limit Hold'em Cash, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

SB: $2 (100 bb)
BB: $5.17 (258.5 bb)
Hero (UTG): $2.57 (128.5 bb)
MP: $2.16 (108 bb)
CO: $2.54 (127 bb)
BTN: $1.58 (79 bb)

Preflop: Hero is UTG with K A
Hero raises to $0.06, 2 folds, BTN raises to $0.18, 2 folds, Hero raises to $0.50, BTN raises to $1.14, Hero raises to $2.57 and is all-in

Is idiotic sizing and leaving a little bit behind a huge sign of strength? Discuss.