5週4日目 選手だっただけに
Evaluation・cause・basis
接続：普通形＋だけに
Because of A, B is stronger
注意 / Note：だけに and からこそ emphasize the reason; ばかりに often leads to unintended bad results.
比較 / Compare：Same song: 〜ばかりに／〜からこそ. These models are often mistakenly chosen for each other — carefully read the 接続 and nuances above and then decide.
よく出る形 / Common form：普通形・名詞＋だけに、〜。The latter is stronger than normal, and can be used for BOTH good and bad results — different from 〜だけあって.
期待していただけに、残念だ。
Because I had high expectations, I was even more disappointed.
経験が長いだけに、判断が速い。
Because of a lot of experience, judgments are quick.
準備に時間をかけただけに、うまくいかなかったのが悔しい。
Because I spent a lot of time preparing, it was even more unfortunate that it didn't work out.