On the contrary, if they risked everything and fought now, Zhou Tian still had some winning odds. After all, even if the two ancient ruins spaces had past grudges, it's been so long that the enemy might not even remember their ancestors' disputes. In this case, if Zhou Tian demonstrated leading combat power, no matter how many troops the enemy sends, it is highly likely that they would all die at Zhou Tian's hand and the enemy would refrain from further conflicts.
Even if the current situation of the enemy is not as good as Zhou Tian expects, they might opt to seal the spatial passage after witnessing Zhou Tian's outstanding performance. If that happens, Zhou Tian's decision of retreating would be a laughing stock.
Obviously, Zhou Tian was restless about just retreating. No matter the risk, he was determined to fight. From the current situation, it seemed Zhou Tian truly had the strength to compete.