At the beginning, Eagle emulated Fantom's style. As time passed, however, it became apparent that his personal style was completely different.
Fantom's style was very indifferent to others' opinions and also had a distinct "my pace" quality to it. He never felt compelled to prove his skills to anyone or to show them off just to make his name known far and wide. In fact, it was other hackers who named him Fantom because he was like a phantom, barely leaving any traces behind. And if he did leave a trace, it was usually out of boredom and an obvious attempt to entertain himself, not because he wanted recognition.
As a result, many claimed to be Fantom, but they could never keep the façade up. They started insisting that they were Fantom and the moment they did so, they automatically proved that they weren't because the real Fantom would never be so fame-hungry.